Describe the "Elephant" exercise on the Reformer.

The "Elephant" exercise on the Reformer is characterized by the practitioner standing on the reformer and engaging in a movement designed to stretch the hamstrings while also providing a challenge for balance and core stability. During this exercise, the practitioner typically bends at the hips with the feet placed on the platform, allowing for a deep stretch through the back of the legs while maintaining alignment throughout the spine. The emphasis is on lengthening the hamstrings and activating the core to control the movement, making it a valuable addition to a Reformer Pilates routine focused on flexibility and strength in the lower body.

In contrast, the other options do not accurately describe the Elephant exercise. For example, sitting and rotating pertains more to exercises that involve spinal rotation, while torso twisting is not a primary focus during the Elephant. Upper body strengthening options would involve different types of exercises that target the arms or shoulders, rather than the hamstring stretch and core engagement emphasized in the Elephant.