If a client cannot perform basic squats or leg presses due to a past back injury, which of the following is a reasonable alternative exercise?

Choosing leg extensions and leg curls as an alternative exercise for a client with a past back injury is reasonable for several reasons.

First, these exercises isolate the quadriceps and hamstring muscle groups, respectively, which helps to strengthen the legs without placing excessive stress on the lower back. Unlike squats or leg presses, which engage multiple muscle groups and may involve significant spinal loading, leg extensions and leg curls can be performed either seated or lying down, often providing better back support.

These movements also allow for a controlled range of motion and can be modified in weight depending on the client's current strength and comfort level, further minimizing the risk of exacerbating any existing back issues. By focusing on isolated leg exercises, the client can still engage in lower body training and maintain muscle strength, which is essential for overall functionality, without compromising their back condition.

In contrast, the other alternative exercises listed may involve movements that could aggravate back problems due to the functional demands they place on the spinal column. This makes leg extensions and leg curls a safe and effective choice for clients with a history of back injuries.