What action should be avoided during the leg curl on a physioball?

In the context of performing a leg curl on a physioball, focusing on inadequate hip extension is crucial because proper hip extension is essential for maintaining the integrity of the movement. During this exercise, the hips should remain aligned with the torso, and failing to achieve adequate hip extension can lead to compromised form and reduce the effectiveness of the leg curl.

When the hips do not extend adequately, it can strain the lower back and limit muscle activation in the hamstrings. It is important to maintain a straight line from the shoulders to the knees throughout the exercise, ensuring that the body is properly engaged. This also helps in stabilizing the core, which is necessary when using a physioball, since the unstable surface requires greater control and balance.

Achieving appropriate hip extension allows the exercise to focus on the targeted muscle groups effectively, promoting better strength and control. Therefore, ensuring proper hip alignment complements safe and effective execution and prevents injury risks associated with inadequate form.