Which exercise on the reformer targets the inner thigh?

The "Adductor Series" is specifically designed to engage and strengthen the inner thigh muscles effectively. This series typically involves movements that require the legs to come together against resistance, which directly targets the adductor muscle group. The use of the reformer allows for controlled resistance and varied body positioning, enhancing the focus on the inner thighs.

In contrast, while other exercises may engage the legs or core in various ways, they do not primarily emphasize the inner thigh muscle group in the same targeted manner. For example, the "Single Leg Kick" focuses more on the hamstrings and glutes, the "Cat Stretch" emphasizes spinal articulation and flexibility rather than leg muscles, and the "Spine Stretch Forward" is geared towards stretching the spine and hamstrings instead of actively working the inner thighs. Therefore, the "Adductor Series" stands out as the most effective choice for specifically targeting the inner thigh area.