So you started going to your gym again and ended up doing a lot of exercises which caused you muscle cramps on your back and shoulder. Now that can be really painful and hamper your regular routine. Don’t let the throbbing pain stop you from performing your daily activities. Use this HealthIQ hot water bag to relax your muscles and eliminate the pain. Easy to Use This beautifully designed gel hot water bag is quite easy to use. Just plug the cord into a power socket to heat the bag and place it on your shoulder.