Release stress and incinerate calories by taking jabs while walking. Begin with your hands in fists in front of your chest. Punch one arm out at a time, rotating each fist so it is palm-side down. Throwing punches tones the upper body and strengthens the cardiovascular system, says Victor Khabie, MD, a sports medicine specialist at the Putnam Hospital Center in Carmel, New York. Walk for five minutes and then jab for one minute. Repeat.