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Step 1
Begin by standing with your feet together and arms at your sides. Tighten your abdominal muscles to pull your pelvis forward and take the curve out of your lower back.
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Step 2
Bend your knees and jump, moving your feet apart until they are wider than your shoulders. At the same time, raise your arms over your head. You should be on the balls of your feet.
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Step 3
Keep your knees bent while you jump again, bringing your feet together and your arms back to your sides. At the end of the movement, your weight should be on your heels.
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Step 4
Repeat the exercise, working in sets and resting briefly in between. As you become more fit, perform jumping jacks faster and for a certain length of time rather than in sets.








