How to give an injection in the muscle?

I AM UNDER WEIGHT BY 12 KG..GIVE ME POSITIVE SUGGESTION TO BUILD MUSCLES...

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

OK so I wannu get ripped in a couple of weeks how???

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?

Right this afternoon I went to my local swimming pool to see friends that have been away over the xmas break (and to mess abo...

I just want to know...what will be the perfect protien drink for building muscle...and gaining weight...I go for gym daily .....

How do you lose thigh muscle? I have muscular legs; I want thin legs. How do you like, lose the muscle?

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...