What is the main focus of the frog and openings exercise in the Supine Leg Series on the reformer?

The main focus of the frog and openings exercise in the Supine Leg Series on the reformer is indeed the adductors. This exercise is designed to engage and strengthen the inner thigh muscles, which are responsible for bringing the legs together. As the practitioner performs the frog and openings, they work on controlling the movement of the legs in a way that emphasizes the adductor muscles while maintaining pelvic stability.

The adductors play a crucial role in stabilizing the hips and enhancing overall leg movement, making them important for activities that require precise control of the legs. Additionally, the exercise encourages proper alignment and balance, which are fundamental principles in Pilates.

While other muscle groups such as the quadriceps, hamstrings, and calves may also be activated during this exercise, the primary focus remains on the adductors, as they are the key contributors to the movement pattern established in the frog and openings.