Jumping jacks are a popular aerobic exercise that involves jumping to a position with legs spread wide and arms raised overhead, then returning to a standing position with feet together and arms at the sides. This exercise helps improve cardiovascular fitness, coordination, and muscle strength, making it a common choice for warm-ups and workouts. To perform jumping jacks, start by standing straight with your feet together and arms at your sides. Jump while spreading your legs and raising your arms above your head, then jump back to the starting position. This simple movement can be done anywhere and requires no special equipment, making it accessible for people of all fitness levels.