I purchased these handgrips primarily to workout whilst watching TV, and they really are up to the job. These handgrips give a sound muscle toning workout to the forearms, without the need for going out of your way to use them. My one criticism is that a day after my first use of them, my palms felt tender and lightly bruised. This did not have a real impact and after about five days of using them, my hands started to adjust to using them, and now I have no trouble with them at all.I feel very happy with my purchase.