Utilizing gravity, the TRX Suspension Training system puts a new spin on bodyweight exercises by adding an element of stability and balance. Regular lunges are enhanced with a suspended leg (which mimics a running position), and suspended crunches require you to use your core to stabilize your entire body as you bring your legs into your body. By strengthening all of those muscles that often get neglected during swim, bike and run training, this workout will not only help prevent injury; it might make you faster too. $200 (includes six workout videos), Trxtraining.com
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