Try This 30-Second Test From a Trainer To Tell Which Muscles in Your Body Are the Weakest If you're not sure how to test your muscle strength, trainer Roxie Jones says a side plank can clue you ...

How are those muscles doing today? We all know that as the years go by, our bodies go through changes. Some are super obvious ...

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 ...