This is the Mytrex Elexa Foot Roller: wearable EMS exercise tool that helps you keep your leg muscles active. It has a roller and two straps that you can use to attach to calves or thighs. It has adjustable oscillation going from 25 to 65Hz in walking mode and 5 to 65Hz in training mode. You can use this with or without the rolling motion.
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This is great for people who need to work their legs or simply stimulate their muscles after a serious injury. You can find out more here.
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