How often should you work out each week?

Your magic number of days depends on how active you already are.

You will probably see results from one day a week if you don't already work out at all. But if you're used to multiple workout days a week then, in general, four to five days a week will challenge your body enough to stay at peak form and make progress.

 ~ N. Tamir, CSCS (founder of T's Fitness)