Here is a training tool that helps relax and exercise your feet with electric muscle stimulation. The SixPad Foot Fit sends 20Hz vibrations through the soles of your feet to your calves to tone them while getting rid of fatigue in your body. It has Bluetooth control and works with iOS and Android devices.
More gadgets like this: here
You will simply need 4 AA batteries to operate this. The bad news? Something like this doesn’t come cheap.
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