What is the Hand Grip Strengthener with Foam Handle? The hand grip strengthener features foam handles to ensure a comfortable grip. The hand grip strengtheners have durable foam handles & resistance springs to increase the strength of the forearm & the hand grip. The hand grip strengtheners can be used to strengthen the muscles in the hands, arms & wrists. They can also help to enhance your performance when taking part in sports such as mountain climbing, gymnastics, motocross, horse riding & weight lifting. When can I use the hand grip strengthener with foam handles? The hand grip strengtheners with foam handles fit easily into sports bags & can be taken & used anywhere for an instant workout for the hands, arms & wrists. How do the hand grip strengtheners with foam handles work? The hand grip strengtheners with foam handles can be held in both the left & right hands. Just simply squeeze the handles together for surprisingly effective training. Hand strengtheners have the added advantage that all strengthening exercises can be done in functional sports related movements making them ideal for sports training & not just for people with injuries.