Power Sleeve It's not unusual to see golfers warming up by swinging two clubs at the same time, but according to the folks who make the Power Sleeve, that's not the best way to get loose. The weighted sleeve attaches to your clubshaft, so you can swing with your normal grip, stretch your muscles, and hit balls at the same time! Plus, it's portable and light enough to carry in your bag, but heavy enough to properly stretch your golf muscles whether on the course, range or at home. $29 www.sklz.com