Punch It Out: Boxing
Boxing is an obvious choice, because, punching. But also, because "it challenges you mentally and physically, and you have to focus on your body movements at all times, there's no room for your mind to wander off into thinking about your horrid ex," says Julie "Jaws" Nelson, boxing instructor at Shadowbox. "Other great benefits include how empowered you feel during and after the workout, the 'revenge body' it will give you, and—obviously—getting to hit things."
Here's an extra pro tip from Jaws: Use your breath with each punch. If you exhale every time you punch, not only will you be able to create a lot more power, but you'll also be releasing so much pent up emotion.
Photo: Corbis Images