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Kicking is about as hard an exercise as you might imagine. Beyond the fact that you are moving about, at high speed, some pretty heavy muscle groups (the largest muscle group in the body apparently) which require lots of oxygen and burn up plenty of fuel, it also requires great tendon strength, good balance and flexibility. This is a "just for kicks" workout that'll push you to the limit of your ability.
Extra Credit: 30 seconds rest between sets.