Insanity | insane abs, upper body weight, max interval dvd & book

INSANITY turns interval training on its head. Instead of holding a moderate pace with short bursts of intensity, you’ll go all out for 3–5 minutes, catch your breath for a sec, and get back to work. This keeps you at maximum capacity the entire workout—it’s called Max Interval Training and it’s how you get into the best shape of your life, fast. New