ttsz//Getty Images For muscles to grow, two things have to happen: stimulation and repair. Dormant cells called satellite cells, which exist between the outer and basement membranes of a muscle ...

PRESENTER:Muscles and bones keep us moving 24 hours ... using graphics to show how we grow inside the womb. What causes us to burp and break wind? videoWhat causes us to burp and break wind?

You have to incorporate a few important strategies into your training regimen in order to trigger the physiologic response that leads to hypertrophy, the process that causes your muscles to grow.

How Muscles Grow You create muscle tension when you contract your muscles against some sort of resistance—like lifting weights or doing bodyweight exercises. Researchers believe that this ...