Originally Posted by Livingitup48
Help me understand because I am lost. How does this help a muscle grow?
Guys, correct me if I'm wrong but higher rep/lower weight doesn't necessarily make the muscle grow. Really you're just burning calories, which can burn fat, which can make the muscles you have more visible. To me, this is what most people mean when they say "I want to look toned." They don't necessarily want the muscles to be bigger, they just want to have more definition.
If you want to make muscles grow, you have to make them work hard, and that usually means lifting heavy. Lifting heavy creates microtears in the muscle fibers, which causes your body to rebuild those tears by adding more muscle.