Muscle Diary

What is Muscle Diary?

Muscle Diary is a free browser game that simulates strength training results with a pixel-art character. Enter your body stats and how much you can lift now, then plan your training week along with food, protein, and sleep. Over 12 weeks (84 days), you'll see your lean mass, body fat, and one-rep max change one day at a time. No sign-up or install needed.

• For each day of the week, pick chest, legs, back, full body, or rest, plus an intensity (light, normal, or to failure)
• Train the same muscles without rest and fatigue builds up; push to failure too often and you may get hurt
• Without enough protein or sleep, muscle grows more slowly
• Track your bench press, squat, and deadlift one-rep max, lean mass, and body fat on a chart

Your data is saved only in your browser and is never sent to a server.

For details, see How to Play and How the Math Works.