Which exercise is performed in a prone position with alternating arm and leg lifts?

The exercise performed in a prone position with alternating arm and leg lifts is the Swimmer. In this exercise, you start lying face down on the ground. As the name suggests, the movements mimic the motion of swimming. You lift your right arm and left leg simultaneously while keeping your torso stable and engaged, then switch to lifting your left arm and right leg. This alternating movement effectively activates multiple muscle groups, including the back, shoulders, and glutes, while also enhancing core stability and coordination.

Other exercises mentioned, such as V-ups, are performed with the body in a supine position, engaging different muscle groups through a different motion. Eight-count pushups involve a series of movements including pushups, and prone rows require the use of weights while bent over, which does not focus on the alternating lifts characteristic of the Swimmer exercise. Thus, the correct identification of the Swimmer as the answer highlights both its unique movement pattern and the specific body orientation necessary for its execution.