A hand gripper works on your wrist muscles and makes them strong enough to support the weight you lift. It also works on your palm muscles which tightens your grip over things and hardens the skin of your palm so that you don’t get rashes while lifting weight.This is great accessory to help toning and building your strength. Especially works on your arms very well. Spring Coil Resistance to help increase your arm strength.Your grip is something that you can and should be training every dayThere’s no way to make your hands or wrists bigger in terms of bone although weight-resistance training and a good diet will increase a bones health and density. Grip strengtheners and forearm exercises, will in time, increase grip strength, flexibility and the size of the forearm muscles.