Step by step instructions, muscle activation and variants for the Half Jumping Jack.
The half jumping jack is a low-impact cardio exercise that mimics the classic jumping jack but uses only the lower body movement — feet step or hop out and back — while the arms remain at the sides or move partially. It is an accessible warm-up or conditioning drill that elevates heart rate with minimal joint stress.
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The Half Jumping Jack is a foundational movement that builds strength and muscle through controlled, progressive overload. Train it 1 to 2 times per week with 3 to 5 working sets per session, gradually adding weight or reps as form holds up.