This website is AMAZING. I LOVE BODYROCKTV It is my workout bible, and best of all, its completely FREE. Tons of workout vids and plenty more to stave off ruts. Most of the routines are between mins long and that's all you need.
love doing this circuit at home when i'm short on time. can do all of the exercises (all 3 circuits) twice in about 20 minutes and break a great sweat! Printable Full-Body Circuit Workout — No Equipment Needed!