Extra sticky pads, nice and cool, if left unused for twelve hour periods of time; the vibration from the battery mimics your heart rate. I use it after twelve hour shifts, to avoid muscle cramps and prepare for the next twelve hour shift. It's cool. It's a short term plan from ages 48 to age 51, hopefully by age 55.
By then maybe my body will not require extraneous assistance due to muscle memory. By then maybe my muscles will remember not to cramp.