A jumping jack, also known as a star jump and called a side-straddle hop in the US military, is a physical jumping exercise performed by jumping to a position with the legs spread wide and the hands going overhead, sometimes in a clap, and then returning to a position with the feet together and the arms at the sides.
Like most cardio exercises, jumping jacks offer cardiovascular benefits. It balances out your heart rate, increases blood circulation all over the body, controls and maintains blood pressure, helps in doing away with bad cholesterol levels in the body, prevents the onset of stroke or heart attacks.

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