[MacPorts] #42449: If you're boxing for fitness benefits, you'll notice your muscles burning, breathing will get harder, and recovery time will increase - resulting in higher intensity. Rest between exercises... Just like a boxer would between rounds. For example, if you're doing fitness strength training exercises that are used by boxers and MMA athletes, after a tri-set squat-deadlift-lunge, rest for 2 minutes. Then go again. A life-saving fitness boxing exercise workout can help prevent cancer via sheddi