You know you should develop a regular exercise routine, but you lack motivation. Promises to yourself are quickly broken, and you never establish enough of the workout habit to experience any rewards.

Growing up seeing magazines promising to help her "get abs quick" put Leah Wei off working out. Now she views exercise as an opportunity to move her body, have fun, and stay healthy.

A muscular, athletic body radiates health and vitality. But how can you really build muscle effectively? FITBOOK takes a closer look at the five most important exercises and shows you how you can ...