This is the Exxentric kPulley Go: a portable strength training tool that uses a flywheel for variable resistance. It can be used indoors and outside. Simply attach it to a squat rack or post, and you are set. This set comes with kGrips, ankle cuffs, and everything you need to get started but you can buy more accessories.
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The kPulley Go can hold up to 2 flywheels. It weighs only 9.5lbs, so you can easily take it around. The drive belt measures 59 inches. You can find out more about it here.
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