Many of the best exercises are often the simplest ones. The exercise this week is one such example. Whether you are looking for a quick warm-up, a calf burner or a cardio spike between resistance training sets the "Jumping Jack" is an oldie and a goodie for a reason. Join Dr. Stacy Naito and Ian Lauer CSCS in the "No Excuses" Calisthenics Training Series as they look at this classic.
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