What exercise involves alternating the knees to the chest?

The exercise that involves alternating the knees to the chest is often referred to as "high knees." This exercise focuses on driving the knees upward toward the chest in a quick, alternating fashion, which not only enhances cardiovascular fitness but also improves lower body strength, coordination, and agility. High knees are typically performed at a fast pace, which elevates the heart rate and engages multiple muscle groups, particularly the hip flexors, quadriceps, and core muscles.

In contrast, some other choices refer to different movement patterns. Shifting the body from side to side does not specifically focus on the knees or involve the upward motion indicative of high knees. Repeaters involve a series of quick, successive movements typically focusing on one leg and do not emphasize the knee-to-chest action. A power squat jumping jack combines a squat with a jumping jack motion, which emphasizes shoulder and leg movements rather than the specific action of bringing knees to the chest. Each of these alternatives does not fulfill the requirements of the knee-to-chest action featured in high knees.