We all know what jumping jacks are - I assume. But just make sure that your legs are bend slightly as to not hyper extend your knees. Try to do jumping jacks as fast as you can and you can even hold weights in your hands, wear a weighted vest and ankle weights. Have fun! Body Mantis is my (Matt McMillin) online journal of how I lost 60 lbs. There are numerous videos of my challenges and exercises, as well as other information.
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