Which exercise is used to develop upper body muscle tone?

The answer is indeed push-ups, as they are specifically designed to target and strengthen the upper body muscles, including the chest, shoulders, and triceps. When performing a push-up, you are engaging multiple muscle groups simultaneously; pushing your body weight off the ground requires significant effort from the pectoral muscles of the chest, the deltoids in the shoulders, and the triceps at the back of the upper arms. This makes push-ups an effective exercise for muscle tone development in the upper body.

In contrast, crunches primarily focus on strengthening the abdominal muscles, which contributes more to core stability rather than upper body tone. Leg raises engage the lower abdominal muscles and hip flexors, again not contributing to upper body muscle development. Burpees are a full-body exercise that incorporates strength and cardio, but their primary focus is not isolated upper body strength. Therefore, push-ups are the optimal choice for developing upper body muscle tone.