Electric muscle stimulators are used by many athletes for recovery. We have already covered a bunch of iPhone compatible EMS devices here. The SixPad Foot Fit is an EMS trainer that soothes your tired feet. It delivers 20Hz of vibration through the soles of your feet to calf muscles to tone them.
You can interact with the device from your iOS or Android devices. The app visualizes how your muscles are being worked. SixPad Foot Fit doesn’t take a lot of space and runs on AA batteries.[where to get it]