More challenging intervals fill the three workouts on Disc Three, designed to take advantage of the gains you’ve made in aerobic performance and now include intervals that target and increase your sustainable power at lactate threshold. 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.