In the leg curl exercise, what is the most common error?

The most common error in the leg curl exercise is indeed allowing the forward knee to travel into the sagittal plane. When performing the leg curl, the movement involves flexing the knee while keeping the hips in a stable position. If the forward knee extends into the sagittal plane, it can compromise the integrity of the exercise, leading to improper form and reduced effectiveness of the movement. This error can also increase the risk of injury, as it may place undue stress on the knee joints.

Maintaining proper alignment ensures that the hamstrings are effectively targeted, which is the primary focus of this exercise. Engaging the correct muscles and maintaining proper biomechanical alignment not only improves the efficacy of the workout but also contributes to overall safety during the exercise. This focus on form is crucial for promoting strength gains and preventing injury during the leg curl movement.