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.
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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