The three workouts on this disc feature high-intensity efforts. Power Intervals are very effective for increasing your power at VO2 max, and increasing performance at the high-end of your aerobic capacity elevates performance at lactate threshold and more moderate intensities as well. Nothing makes you faster on a bike then increasing your overall power. Carmichael Training Systems Progressive Power DVD’s are designed to do just that – use them independently, or combine all 5 DVD’s, to get 16 power workouts that studies show can increase your overall sustainable power by 12% (Klika, et al., 2000). Each DVD contains three 1-hr workouts. CTS Field Test disc is included with each order.