Jumping Jacks Stand with your feet together and your hands at your sides. Jump your feet out laterally, just past your shoulders, while swinging your arms overhead. Then immediately jump back to center while bringing your arms back to your sides. Repeat in a continuous motion for 60 seconds for 2 to 4 sets. Mountain Climbers Place your hands and feet on the ground in a push-up position. Your hands should be slightly wider than your shoulders. Bring one knee at a time up to your chest while staying in push-up position. Keep alternating legs and moving them continuously to your chest and back for 30 seconds. Perform 2 to 4 sets with a minute of rest in between. Jump Rope Stand with your feet shoulder width apart and grip a jump rope at the handles behind your back. Jump a few inches into the air and, at the same time, whip the jump rope over your head and sweep it under your feet. Repeat in a continuous motion for 30 seconds. Perform 2 to 4 sets with a minute of rest in between. Running Sprints Walk briskly for 2 minutes to warm up. For the first interval, jog at 25 percent of your maximum capacity, followed by a brisk 2-minute walk. Next, run for 20 seconds at 50 percent of your maximum capacity, followed by another 2-minute walk. For the third interval, run at 90 percent for 15 seconds, then briskly walk for 2 minutes. For the final interval, sprint at 100 percent for 10 seconds, followed by a 4-minute walk. If you want to challenge yourself, repeat the final interval a few times.