Obby: Pump Up Your Muscles

About this game

Welcome to the prison gym, where only strength earns respect! You start as a skinny rookie, but every rep makes you stronger. Push-ups, sit-ups, pull-ups — build your body and rise through the ranks.

How to play

1. 1WASD — move your character
2. 2Space — jump
3. 3E — interact (train, eat, grab food)
4. 4Left Mouse Button — train

Controls: Single player · Landscape

Tips and strategy

• Reps and food are two halves of the same loop. Training drains what eating puts back, so plan your break to the food counter before you are empty rather than in the middle of a set.
• E covers everything that is not a rep, such as eating, grabbing food and moving to a new station, while the left mouse button is for the set you are already standing in.
• Push-ups, sit-ups and pull-ups all feed the same character, so there is no wrong exercise to pick. The only wasted session is one where you leave the gym without eating.
• It is tagged relaxing for a reason. Strength only ever climbs, so there is no run to lose and no clock to beat, and a long unhurried session is the intended way to play.

Game details

Developer

GamePush

Released

Jun 26, 2026

Updated

Jun 26, 2026

Players

Single player

Category

SimulationArcade

Tags

Frequently asked questions

How do I train in Obby: Pump Up Your Muscles?

Walk up to a station with WASD, then press E to interact or hold the left mouse button to knock out reps. Space is only for jumping around the gym, not part of a workout.

Do I need to eat to get stronger?

Yes. Eating and grabbing food sit alongside the training in the same loop, so a session only keeps going if you break off for food. Strength comes from reps, but the reps need feeding.

Is Obby: Pump Up Your Muscles free to play?

Yes. It runs straight in your browser with nothing to download and no account to create, so you can start a workout and leave it whenever you like.