TENS is generally pretty safe if applied with care and good sense (likely not applicable here). The risk is primarily to people with pre-existing heart conditio

TENS is generally pretty safe if applied with care and good sense (likely not applicable here). The risk is primarily to people with pre-existing heart conditions. Though obviously enough electricity through the chest will kill a healthy adult. The exercise value is pretty low, as I understand. Wrong type of muscle activation. It's primarily used for recovery after exercise or for cueing aches and pains.