Obby: Pump Up Your Muscles

Obby: Pump Up Your Muscles is a free gym simulator set in a prison gym, where only strength earns respect. You start as a skinny rookie, and every rep makes you a little stronger. Push ups, sit ups and pull ups build your body, and the stronger you get, the higher you rise through the ranks.

From Rookie to Strongest

When Obby: Pump Up Your Muscles starts, you are the weakest person in the gym. Every training session adds a bit of strength, and slowly your character grows bigger and more muscular. Watching that change is a big part of the fun.

Train, Eat and Repeat

Training is only half of the job. You also need to eat, so you can grab food around the gym and keep your strength growing. Switching between exercises keeps progress steady.

Climb the Ranks

Strength decides your place in the gym. As your muscles grow, you move up the ranks and earn the respect of the other inmates. The goal is to become the strongest of all.

Keys and Mouse

Move with W, A, S and D and jump with the spacebar. Press E to interact, train, eat or grab food, and click the left mouse button to train. Move the mouse to look around and use the mouse wheel to zoom in and out.

Tips for Faster Gains

Keep clicking while you train, since every rep counts. Do not forget to eat between sessions. Try all of the exercises, because some may help you grow faster than others as you progress.

You can play Obby: Pump Up Your Muscles online for free on Yup7 with nothing to download, on computers and Chromebooks. Obby: Pump Up Your Muscles is one of many free simulation games on our Simulation Games page.

Gym Questions

Where does the game take place?

In a prison gym, where strength earns respect.

How do I get stronger?

Train with push ups, sit ups and pull ups, and eat to keep growing.

How do I train?

Click the left mouse button, or press E at a training spot.