Q: In The Ultimate Mass Workout you suggest doing the hills setting on a treadmill or interval cardio with sprints as the Ultimate Exercise for calves. Can you explain more about the interval sprinting and treadmill effects on calf training, as well as how to integrate intervals into my workouts?

A: The Ultimate Mass Workout is our first e-book, the original X-Rep manual, and after we published it, we discovered a big midrange exercise for calves you can do as part of your leg workout in the gym—knee-extension leg press calf raises…

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