Jumping jacks are a classic full-body exercise that elevates your heart rate while engaging multiple muscle groups. To perform a jumping jack, start standing upright with your feet together and arms at your sides.

1. Jump up while simultaneously spreading your legs shoulder-width apart and raising your arms above your head.

2. Land softly with your feet back together and arms returning to your sides.

3. Repeat the movement at a steady pace.

This dynamic exercise activates the legs, arms, and core, making it an excellent warm-up or cardio workout. Jumping jacks can be modified for all fitness levels, allowing you to adjust the intensity by increasing the speed or adding variations like clapping at the top. They're great for improving coordination, agility, and cardiovascular endurance.