Gym Upgrades Tier List
Last verified: 2026-07-08
Why Gym Order Matters
Gym equipment determines base muscle per training tick before pets and rebirth multipliers apply. Wrong upgrade order slows both pushing and egg income in +1 Muscle to Push Boulder by Doolittle!.
This wiki covers +1 Muscle to Push Boulder by Doolittle! (Place ID 136107936984073). It is not Sisyphus Muscle Push, Push A Rock, or +1 Muscle to Arm Wrestle — those are separate Roblox titles with different mechanics, developers, and code lists.
We rank upgrades within each world separately because muscle gates block access to higher tiers until you push far enough on boulder route.
Universal Upgrade Priority
S Priority — Highest muscle-per-coin upgrade available in your current world. Always buy these before cosmetic stations.
A Priority — Secondary stations that unlock synergy buffs (area-wide +% muscle if the game includes them).
B Priority — Mid-tier fillers when S gates require push milestones you cannot hit yet — train on B while farming push attempts.
C/D — Tutorial dumbbells and flavor equipment — upgrade once, never revisit.
World-by-World Notes
Starter gym: max cheap stations before first rebirth consideration in rebirth timing guide.
Second world+: sync gym spend with unlock requirements so you never enter a zone under-geared.
Full station names and costs: gyms item page.
Gyms vs Pets vs Rebirth
Gyms are foundational; pets multiply gyms; rebirth multiplies everything. Overspending on gyms before a planned rebirth can be correct if breakpoints align — use rebirth calculator.
Compare DPS gains with muscle calculator before buying luxury upgrades.
See tier list hub for pet and egg rankings that pair with this gym order.
Tier Methodology in Practice
Tier placement for +1 Muscle to Push Boulder combines muscle per minute benchmarks, push checkpoint clears, and hatch return on investment. A pet ranked A-tier might be S-tier during a luck event — watch pet events. Gym upgrades that look B-tier in isolation can become S-tier when paired with rebirth multipliers from the rebirth build.
Use tiers as decision support, not gospel. Record your own muscle per minute before and after equip changes using the muscle calculator. When Doolittle! rebalance hatch tables, revisit pets and eggs item pages alongside this tier list.
Wiki Methodology & Verification
This tier-list/gym-upgrades article was last verified on 2026-07-08 against live testing in +1 Muscle to Push Boulder on Place ID 136107936984073. We prioritize in-game confirmation over datamine leaks, copied code lists from unrelated muscle simulators, or unverified social reposts. When Doolittle! ships a balance patch, numbers in tier lists, unlock tables, and calculator defaults may shift until we re-test.
Cross-linking is intentional: muscle progression touches gyms, pets, eggs, rebirth, and boulder routes simultaneously. Use the guides hub, tier list hub, and tools hub together rather than reading a single page in isolation. If you notice outdated text after an update, compare the in-game UI first, then check the latest updates page for patch notes.
This wiki covers +1 Muscle to Push Boulder by Doolittle! (Place ID 136107936984073). It is not Sisyphus Muscle Push, Push A Rock, or +1 Muscle to Arm Wrestle — those are separate Roblox titles with different mechanics, developers, and code lists.
Fan wikis complement but never replace official channels. Like and Favorite the Roblox experience to receive update notifications when code milestones or new worlds arrive. For promo codes specifically, trust only the active codes page after verification — not recycled strings from Sisyphus Muscle Push, Push A Rock, or +1 Muscle to Arm Wrestle.
Extended Reference Notes
Reference pass 1 for "tier-list › gym-upgrades" documents practical habits top +1 Muscle to Push Boulder players use after 2026-07-08. Keep a personal log of muscle per minute at your best gym, current rebirth multiplier, and latest push checkpoint cleared on the boulder route. When any of those three metrics stall for two sessions, switch guides: training stalls → fast progress and gym tiers; push stalls → push build and crush guide; hatch stalls → pet optimization and egg tiers.
Account security matters as much as strategy. Never run unverified loadstrings from the auto train page on mains you value. Never paste Roblox passwords into code sites promising +1 Muscle to Push Boulder rewards. Official promo codes, when they exist, are plain text in the Roblox description or Doolittle! socials — not executable scripts. This wiki covers +1 Muscle to Push Boulder by Doolittle! (Place ID 136107936984073). It is not Sisyphus Muscle Push, Push A Rock, or +1 Muscle to Arm Wrestle — those are separate Roblox titles with different mechanics, developers, and code lists.
Finally, treat this wiki as a living document tied to Place ID 136107936984073. Patch day checklist: read updates, re-test one gym tier and one egg tier, refresh codes, and skim tier list hub diffs. Thirty minutes of verification prevents hours of grinding with outdated assumptions copied from Sisyphus Muscle Push, Push A Rock, or +1 Muscle to Arm Wrestle.