... by short breaks to recover. The routines can contain an unlimited variety of exercises including body weight training, Olympic lifting, plyometrics (jump training), weight training, and sprints. This style of training has become so popular because ...
http://www.thepostgame.com/blog/training-day/201312/high-intensity-interval-workout-hiit-hasfit
http://www.thepostgame.com/blog/training-day/201312/high-intensity-interval-workout-hiit-hasfit
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