"Punching the heavy bag is one of the best ways to get your aggression out while simultaneously burning a ton of calories," said Chris. "Not to mention, boxing is a great form of self-defense. I suggest hitting the bag in intervals such as 30-60 seconds all-out effort, followed by 30-90 seconds rest. Repeat 6-10 times. Make sure to keep your wrists straight when making contact with the bag!"