Which of the following is an example of a compound exercise?

A compound exercise is defined as a movement that involves multiple joints and muscle groups working together to perform the action, promoting greater overall muscle engagement and functional fitness. The deadlift is an exemplary compound exercise because it engages several major muscle groups, including the glutes, hamstrings, lower back, and core, while also requiring the involvement of the muscles in the upper body to stabilize and lift the weight. This holistic engagement not only builds strength but also enhances coordination and balance, making it a fundamental movement in many strength training regimens.

In contrast, the other options primarily target individual muscle groups through isolated movements. Bicep curls focus solely on the biceps, leg extensions isolate the quadriceps, and calf raises primarily engage the calves. While these exercises can be beneficial in a balanced workout program, they do not provide the multi-joint engagement characteristic of compound exercises like the deadlift.