Aerobic development is the name of the game in the three workouts on disc two with a mixture of moderate intensity tempo intervals and steadystate intervals at just below your maximum sustainable intensity the workouts on this disc directly target your aerobic enginenothing makes you faster on a bike then increasing your overall power carmichael training systems progressive power dvds are designed to do just that use them independently or combine all 5 dvds to get 16 power workouts that s