Boxing is a great outlet for stress for two reasons: First, during a boxing workout you typically transition between high intensity bouts of exercise and moderate intensity recovery periods. When you’re pushing yourself through a couple minutes of high-intensity punching or kicking, you don’t have much mental power left to worry about how awful your job is, or how dirty your house is. And even during rest periods, you’ll be focused on sucking wind and mentally preparing for the next round, not stressing over your packed schedule.