If it feels too easy, tweak the work-rest intervals to challenge yourself by matching or even exceeding your rest time with your work time. For intermediate levels, try 30 seconds of exercise followed by 30 seconds of rest. For advanced levels, push yourself with 40 seconds of exercise and just 20 seconds of rest.
1. Skater Jumps

Stand with your feet hip-width apart, arms relaxed by your sides. Start by planting your right foot firmly on the ground, and cross your left leg behind you to the right, mimicking a curtsy lunge. As you do this, shift your weight onto your right leg. Simultaneously, lift your right arm to shoulder height and sweep your left arm across your body towards your right hip.
Next, push off and jump to your left, landing softly on your left foot. Swing your right leg behind you to the left, while your left arm extends outward and your right arm reaches towards your left hip.
Keep leaping side to side, with your arms moving in a fluid, skating motion. For an added challenge, try touching the ground with your hand instead of just swinging it out to the side.
2. Body-Weight Squats

Stand with your feet shoulder-width apart, toes pointing straight ahead. Shift your weight into your heels as you bend your knees, lowering your hips until your thighs are parallel to the floor (or as close as you can comfortably manage). Keep your chest lifted and your knees aligned over your toes, making sure they don’t extend past your feet. As you descend into the squat, extend your arms forward until they’re aligned with your shoulders.
Pause at the lowest point of the squat, then press through your heels to rise back up, bringing your arms down and behind your hips as you stand. Repeat the movement. For an added challenge, try jumping explosively out of the bottom of the squat to return to standing.
3. Walking Lunges
