Muscle Legends Codes & Free Robux Guide (September 2026) -- All 6 Gyms, Rebirth Costs, Game Pass Prices & Training Tips

By Money Lord — Founder & Editor | Updated: September 6, 2026

Muscle Legends by Scriptbloxian Studios has been a Roblox staple for years, sitting at 2.29 billion visits as of September 6, 2026, with a seven-day concurrent median of 13,273 players. The loop is simple: train three stats, rebirth for a stacking bonus, spend those rebirths on better gyms, and fight other players. This guide covers the real gym ladder and what each gym costs in rebirths, exactly what a rebirth takes and gives, every game pass with its live Robux price, PvP tips, and how to pick up free Robux to grab those passes.

What Is Muscle Legends?

Muscle Legends is a fighting simulator on Roblox where you build your character from a scrawny beginner into an absolute powerhouse. It is published by Scriptbloxian Studios -- the Roblox group the game links from its own description now displays as "Muscle Legends Studio" (group 874427664, 303,224 members as of September 6, 2026 — up from 186,212 on August 21). The game was created on August 9, 2019 and has since pulled in 2,290,967,570 visits and 2,593,383 favourites (September 6, 2026). That's not a typo -- billions with a B.

The current build landed on September 5, 2026. Scriptbloxian posted the change list on the game's own Roblox event page ("Next HUGE update!", September 5–7, 2026), and it is a big one for the pet and endgame layers: new Boss Battles with their own rewards, new Solar Eggs, a new Hell Pack, two new stats — Pet Momentum Speed and Boss Damage, new daily log-in rewards, a UI overhaul, a multi-sell feature, better inventory management, and the pet momentum cap raised to 150x. Boss Damage is the one that changes how you spend: it is a stat the gym ladder below does not train, so pets and the new bosses now sit alongside strength as a progression track of their own. A follow-up update, "Pet Enchantment + MORE!", is already scheduled on the same page for September 19–21, 2026.

Our tracker read the game every six hours across August 30 to September 6, 2026: the seven-day concurrent median is 13,273 players in a range of 9,028 to 27,062. That figure splits at the September 5 patch — a median of 12,639 across the 24 readings before it and 17,861 across the three readings after (16,549 to 18,922). We publish medians rather than a single live number, because one reading is a snapshot rather than a trend.

The core gameplay revolves around three trainable stats: strength, agility, and durability. You train them at gym equipment, and each does a different job. Strength is the main currency -- it is what you spend to rebirth, what unlocks equipment, and what lets you knock other players out. Agility comes from treadmills and controls your movement speed. Durability comes from rocks and is your health pool. Sitting on top of the stats are pets, crystals, auras and karma, which are collected rather than trained and which survive a rebirth.

What keeps players hooked is the rebirth system. Once you hit the strength threshold, you trade your progress in for a permanent training bonus that stacks with every previous rebirth -- and the rebirths themselves are the currency that unlocks the game's six gyms. It creates a satisfying loop where you're constantly getting stronger at a faster rate.

The game sits in the fighting and simulator genre on Roblox, and it draws comparisons to titles like The Strongest Battlegrounds for its PvP elements. But Muscle Legends focuses more on the grind-to-fight pipeline than pure combat mechanics. You can find the game on its official Roblox page.

The Starter Gym in Muscle Legends where every player begins their training journey

Muscle Legends Codes

Last checked: September 6, 2026

Codes in Muscle Legends hand out gems, strength and agility, and they are the single fastest way to shortcut your first few rebirths. We keep the live list -- active codes, expired codes, rewards and the exact redemption steps -- on one page so it only ever has to be corrected in one place: Muscle Legends codes.

Two things are worth knowing before you go there. First, the game's own Roblox description advertises a set of "secret in-game codes" that appear nowhere in the game's UI -- as of September 6, 2026 those were still megalift50, speedy50, spacegems50 and ultimate250. Second, unlike most Roblox titles, Muscle Legends codes are not case-sensitive, so you do not have to match the capitalisation a tracker shows you.

New codes usually land alongside game updates and follower or like milestones, so re-check the codes page after any patch.

Gym Progression Guide -- Frost to Jungle (2026)

Muscle Legends has six gyms, and every one of them is bought with rebirths, not with strength or gems. The gyms are portals on the Main Island (the Jungle Gym portal sits past Legend Beach), and each one holds better machines, better chests and better pet crystals than the last. Here is what each gym actually costs.

The Main Island and Legend Beach

Everyone begins on the Main Island. It has more equipment than anywhere else in the game, but the quality is the lowest and its pet crystals are the worst -- so the correct play is to stop caring about the island as fast as possible and rebirth out of it. The one exception is the 1,000-agility treadmill on the island, which is genuinely better than anything on Legend Beach.

Legend Beach is the odd one out on this list because it is the only area gated by a stat rather than by rebirths: 2,500 strength gets you in. It is worth walking over the moment you can, because the Golden Rock and the bigger treadmills there beat the island's, and the beach's gem chest pays out 1,000 gems every six hours whether you are training or not.

Frost Gym (1 rebirth) and Mythical Gym (5 rebirths)

The Frost Gym is your reward for the very first rebirth and it is where most of your early hours will go. Its bench presses step up at 1K, 3K, 7.5K and 15K strength, so it carries you comfortably past the second and third rebirth thresholds, and the 150K-durability rock is the first real durability source you will have access to.

The Mythical Gym at 5 rebirths is the biggest single jump in the game. The Mythical Pull-ups are the reason: they need 4K or 8K strength to use, and unlike almost every other machine they pay out strength and agility at the same time. Between those, the 2K/3K treadmills, the 15K bench set and the 400K Mystic Rock, one gym covers all three stats.

The Mythical Gym at 5 rebirths is the biggest single equipment jump in the game

Muscle King Gym (5 rebirths)

The Muscle King Gym is not a normal gym and it is the one most guides get wrong. It costs the same 5 rebirths as the Mythical Gym, but only one player at a time can train in it -- the Muscle King. If the throne is empty you take it automatically; if it is not, you have to kill whoever is sitting on it. In exchange, the King trains on the best machines in the game, collects gems every 5 seconds, and gets a free duplicate training tick every 5 seconds on top of whatever they are actually doing. It is the fastest strength in the game and also the least reliable, because someone will come for you.

Eternal Gym (15), Legends Gym (30) and Jungle Gym (60)

These three are the endgame, and their ordering is the thing worth memorising: Eternal is not the final gym. Eternal costs 15 rebirths and is deliberately sparse -- three machines, one of each type, in a very open room with an orange halo and lava down the sides. Its draw is the chest, which pays 1.5K gems where every other chest in the game pays 1K.

The Legends Gym at 30 rebirths is where the strongest treadmills and strength tools in the game live, and it is the only gym with two pet crystals. For raw strength it is second only to holding the Muscle King throne.

The Jungle Gym, reached through Legend Beach rather than from the Main Island, is the real wall at 60 rebirths. There is one thing in it -- the Jungle Crystal -- and it costs 3,000,000 gems to open, which makes it comfortably the most expensive item in Muscle Legends.

Rebirth System Explained (2026)

The rebirth system is the backbone of Muscle Legends' progression, and it is also the mechanic most third-party guides describe wrongly. Understanding what a rebirth actually costs and pays is the difference between hitting a wall at mid-game and cruising through to the endgame content.

What a rebirth takes, gives and keeps

A rebirth is not a full wipe. Here is the exact trade:

• You lose: 100% of your strength, 100% of your durability, and 50% of your agility -- agility is only halved, not zeroed.
• You gain: a permanent +5% boost to strength, durability and agility that stacks with every previous rebirth, plus a gem payout.
• You keep: your karma, your pets, your consumables, your auras, and every gym you have already unlocked.

That +5% figure matters. Rebirthing does not double your training rate -- the compounding is gentle and additive, and the real acceleration comes from the gyms your rebirth count unlocks, not from the bonus itself. Anyone telling you your first rebirth gives you "2x" is guessing.

How the thresholds scale

Your first rebirth unlocks at 10,000 strength. After that, the requirement climbs by a flat 5,000 strength per rebirth -- so 15,000 for the second, 20,000 for the third, and so on. That is linear, not exponential, which is why very high rebirth counts are reachable at all: by the time you are chasing the Jungle Gym at 60 rebirths, the threshold is large but your stacked bonus and your endgame machines have grown with it.

Because rebirths are the currency for gyms, it is worth knowing the checkpoints in advance: 1 (Frost Gym), 5 (Mythical Gym and Muscle King Gym), 15 (Eternal Gym), 30 (Legends Gym) and 60 (Jungle Gym).

When to Rebirth

Rebirth as soon as you hit the threshold. There's no advantage to waiting. Some players think they should keep training past the minimum, but that's a trap. Every minute you spend training past the rebirth threshold is a minute you could be spending on the next threshold, with the extra 5% already applied. Rebirth fast, rebirth often.

The one exception: if you're about to log off and want to come back to a character that can still fight, you might push past the threshold a bit so you have some strength and durability when you return -- a freshly rebirthed character is an easy target on the Main Island.

Training Strategy and Tips (2026)

Training efficiently in Muscle Legends isn't just about clicking fast. It's about knowing which stats to prioritize at each stage of the game and how to maximize your gains per session. Here are the strategies that experienced players use.

Early Game (Pre-Rebirth 5)

Strength is your only priority. Everything else can wait. The reason is simple: strength is the only stat the rebirth threshold looks at, and rebirthing is the single most impactful thing you can do for your account's progression. Each rebirth adds +5% to strength, durability and agility alike, so rushing strength and rebirthing quickly speeds up all three in the long run -- and, more importantly, buys you the gyms.

Redeem the codes from the codes page during this phase. The free strength they hand out will shave real time off your first few rebirths, and the gems go straight into pet crystals.

Mid Game (Rebirth 5-15)

Once you're through the 5-rebirth checkpoint and the Mythical Gym is open, start branching out. Agility is the next priority because movement speed affects how quickly you can reach equipment and opponents, and because agility is the one stat a rebirth only halves rather than wipes -- what you build carries forward.

Durability comes third. You'll need it for PvP fights and for the rocks themselves, which gate on durability: the Frost Gym rock needs 150,000 and the Mythical Gym's Mystic Rock needs 400,000. The Mythical Pull-ups are the efficient answer here, since they pay strength and agility from the same machine.

Balancing your stat training becomes important as you progress through rebirths

Late Game (Rebirth 15+)

At this point your stacked rebirth bonus and your endgame machines are doing most of the heavy lifting. Training is fast regardless of which stat you focus on, so now it's about optimisation: keep strength, agility and durability roughly balanced, because in PvP a rounded fighter beats someone who dumped everything into strength and cannot take a hit.

Gems are the other half of the endgame. They come from codes, from the timed chests (1,000 gems every 6 hours from most, 1,500 from the Eternal Gym's), and from holding the Muscle King throne. You are saving toward pet crystals -- the Frost Crystal at 5K, the Mythical Crystal at 8K, and eventually the Jungle Crystal at 3,000,000.

AFK Training

There is no "auto train" pass in Muscle Legends, despite what a lot of guides claim. The closest thing the game actually sells is Auto Lift (499 Robux), which handles the lifting machines for you. Everything else -- treadmills for agility, rocks for durability -- still needs you at the keyboard. Plan your sessions accordingly rather than expecting to bank stats overnight.

Game Passes Breakdown (September 2026)

Muscle Legends sells nine game passes, all nine of them currently on sale. The prices below were pulled live from Roblox's game-pass API on September 6, 2026 -- not estimated, not rounded. All nine are unchanged from our August 21 reading. If you see a guide quoting a "VIP" pass or an "Auto Train" pass for this game, it is describing passes that do not exist.

Where "VIP" actually comes from

Muscle Legends has no VIP game pass. What it does have is a Roblox Premium benefit bundle, advertised in the game's own description: x2 strength from training, +2 daily fortune spins, x2 chest rewards, and +1 pet slot. That is a Roblox subscription, not a 199-Robux purchase, and it is almost certainly the source of the phantom "VIP pass" you will find quoted elsewhere. Joining the Scriptbloxian Studios group is separate again and free -- it unlocks the group chest and +1 daily spin.

x2 Strength (349) and x2 Gems (249)

If you buy exactly one pass, make it x2 Strength at 349 Robux. Strength is the rebirth currency, rebirths are the gym currency, and gyms are the entire progression curve -- doubling the top of that chain doubles everything under it. It is at its strongest in the first twenty rebirths, when thresholds are still small enough that a doubled rate visibly changes your session length.

If you buy a second, make it x2 Gems at 249 Robux, and it is arguably the better long-run pick. Every meaningful gem sink in the game is enormous -- 5K for the Frost Crystal, 8K for the Mythical Crystal, and 3,000,000 for the Jungle Crystal -- and gems are the only thing standing between you and pets, which are permanent and survive rebirths.

Auto Lift (499) and the capacity passes

Auto Lift is the closest Muscle Legends comes to AFK progression: it works the lifting machines for you, but treadmills and rocks still need input. At 499 Robux it is the most expensive tier in the game alongside +2 Pet Slots and x2 Rep Time, so treat it as a comfort purchase rather than a progression one.

The two capacity passes are the same upgrade at two sizes -- +20 for 99 Robux and +60 for 289 Robux. Buy the larger one directly if you can afford it; buying +20 first and +60 later means paying 388 Robux for a benefit you could have had for 289.

Wondering how to get these passes without spending your own money? Check out the free Robux section below, or read our Blox Fruits Free Robux Guide for more ways to earn Robux that work across any Roblox game.

Fighting and PvP Tips (2026)

Training is only half of Muscle Legends. The other half is fighting -- and winning fights is where you prove all that grinding was worth it. PvP in Muscle Legends is stat-based, but there's more nuance than just "bigger numbers win."

How Fighting Works

Fights come down to your three stats versus theirs. Strength is your damage output -- it is literally the stat used to kill other players. Durability is how much damage you can absorb. Agility governs your movement, which decides whether you can close the distance or get away at all.

The practical consequence is that a rounded fighter beats a strength-only build more often than not, because a character with no durability dies before their damage matters. You don't need the three stats equal, but a build that ignores one of them is exploitable. This is also why the Muscle King Gym is a PvP arena as much as a training room: the only way onto the throne is to kill whoever is on it.

PvP Strategy by Game Stage

Early game: Don't fight. Seriously. You're better off spending every second training and rebirthing. Fighting at low levels gives minimal rewards compared to the time you could spend training. Wait until you've completed at least a few rebirths before engaging in PvP.

Mid game: Start fighting players near your level. You can gauge someone's approximate power level by their size and appearance. If they're noticeably bigger than you, they probably have higher stats. Pick fights you can win to build up rewards and confidence.

Late game: At this stage, you're fighting for leaderboard position and bragging rights. Your stats are high enough that small differences in training approach make the difference. Players at this level usually have Game Passes, multiple high-tier rebirths, and well-balanced builds.

Fighting Tips That Actually Work

First, always check your opponent's size before accepting a fight. In Muscle Legends, character size roughly correlates to total stats. A player who towers over you is going to be tough to beat.

Second, invest in durability before you think you need it. The most common mistake in PvP is having great offense but poor defense. You might hit hard, but if you go down in two hits, your strength doesn't matter.

Third, use agility to your advantage. Faster characters get more hits in during a fight. If you're slightly weaker than your opponent in raw power, superior agility can make up the difference through sheer number of attacks. This is similar to fighting strategies in The Strongest Battlegrounds, where speed and timing can outweigh raw power.

PvP fights in Muscle Legends test strength, agility and durability at the same time

Earning Free Robux for Muscle Legends (2026)

Game Passes like VIP and Auto Train make a real difference in Muscle Legends, but not everyone wants to spend real money on Robux. If you're looking for ways to earn Robux without pulling out your wallet, there are a few legitimate options.

Earnaldo lets you earn free Robux by completing offers, watching videos, and finishing tasks. The Robux goes straight to your Roblox account, and you can spend it on whatever you want -- including Muscle Legends Game Passes. It's a straightforward way to pick up enough Robux for a VIP pass or Auto Train without spending cash.

Other methods include creating and selling Roblox items if you have a talent for design, participating in Roblox's affiliate program, and joining game giveaways from developers. Some players also trade limited items for Robux, though that requires knowledge of the Roblox trading market. For more strategies specific to different games, check out our Anime Vanguards Free Robux Guide.

About This Guide

This guide was written for players at every level of Muscle Legends -- from brand-new accounts to endgame grinders pushing for the Jungle Gym at 60 rebirths. It was last re-verified on September 6, 2026.

Every number on this page has a source. Player counts, visits, favourites and the creation date come from Roblox's own games API for universe 1268927906, read on September 6, 2026, and the concurrent medians come from our own six-hourly readings across August 30 to September 6. Game pass names and prices come from Roblox's game-pass API for the same universe, read the same day; the September 5 change list is quoted from the game's own Roblox event page -- which is how we can say there are exactly nine passes and that none of them is called VIP or Auto Train. Rebirth costs, gym unlock costs, equipment requirements and crystal prices come from the Muscle Legends Wiki. The "secret in-game codes" and the Premium benefit list are quoted from the game's own Roblox description. We have no in-game access, so nothing on this page is presented as first-hand testing.

If you notice a code has expired or a new code has been released that we haven't listed, join our Discord community and let us know. We aim to keep this guide accurate and current so you always have the best information available.

Looking for guides on other popular Roblox games? Check out our Blox Fruits guide for fruit tier lists and codes, or the Anime Vanguards guide for tower defense strategies.

More Muscle Legends

• Muscle Legends codes -- the live active and expired code lists, rewards and redemption steps.
• Muscle Legends hub -- current update, player numbers and every guide we have for the game.
• Muscle Legends vs The Strongest Battlegrounds -- grind-to-fight against pure combat.
• Muscle Legends vs Super Power Fighting Simulator -- the closest comparison in the training-simulator genre.

Frequently Asked Questions