What is a suprapinatus muscle?

What are some good ways to develop fast twitch muscle fiber? Anyone know?

I heard that when running, the most used muscle is your abdomnal??? is it true??

what are the major superficial muscle groups? what do they do? how do they work?

Does squeezing your tummy muscles help tone up?

I have a few questions about muscles. Would bike riding and running gain lower leg muscles? And if not, what will ? And how l...

Are there protein pills,to make you gain muscle?

Is it possible to pull a muscle in your armpit? I was fixing my shower, and stretched a little too far. Now my armpit hurts i...

How long do you think it would take to get more muscle on my legs?

I want to build more muscle, and lose a lot of fat. What should I be eating to do so? If I only eat things without fat calor...

is it posible for a 15 year old to have 94 percent body muscle casue thats what this guy is telling me