Which of the following is a warm-up stretch?

Jump squats are considered a warm-up stretch because they effectively prepare the body for more intense physical activity. This dynamic movement engages multiple muscle groups, including the legs and core, increasing blood flow to these areas. Additionally, jump squats elevate the heart rate and enhance overall flexibility, making them a suitable choice for warming up before engaging in more strenuous exercises.

In contrast, leg presses primarily focus on strength training without the dynamic stretch required in a warm-up. Plyometric box jumps are more intense and are better suited for agility or power training rather than warming up. Curl-ups are a strength exercise targeting the abdominal muscles rather than serving a warm-up purpose.