Which activity is considered a plyometric exercise?

Plyometric exercises are designed to improve power and explosiveness by utilizing the stretch-shortening cycle of muscle contractions. Box jumps are a prime example of a plyometric exercise because they require the athlete to quickly and forcefully jump onto a raised surface, engaging fast-twitch muscle fibers. This explosive movement trains the body to generate maximum force in a short period of time, which is the hallmark of plyometric training.

In contrast, squats, leg presses, and planks are more traditional strength training or stabilization exercises. Squats and leg presses focus on developing strength through controlled movements without the explosive element necessary for plyometrics. Conversely, planks are isometric exercises aimed at building core stability and strength, lacking the dynamic and explosive characteristics of plyometric activities. Thus, box jumps stand out distinctly as a plyometric exercise within the options provided.