How should a Double-Leg Stretch be modified to prevent arching in the lower back?

The modification of straightening the legs to a vertical angle during the Double-Leg Stretch is beneficial for preventing arching in the lower back. When the legs are brought up to a vertical position, it helps to engage the core more effectively. This engagement stabilizes the pelvis and lumbar spine, encouraging proper alignment and reducing the risk of hyperextension or excessive arching in the lower back.

A vertical leg position also allows for a controlled movement range, enabling the practitioner to maintain a stable base while still working the abdominal muscles. This strong core engagement is essential for protecting the lower back during the exercise, making it a suitable modification for those who may struggle with keeping their back flat against the mat when lowering their legs.

The other options do not provide the same stability and core engagement. Bending the knees offers less extension of the legs and may lead to less tension in the abdomen, which can result in instability. Performing the exercise on all fours changes the dynamics significantly, making it a different exercise altogether rather than a modification of the Double-Leg Stretch. Lowering the arms to the sides might aid some individuals in maintaining balance, but it doesn't directly address the alignment of the spine related to the legs’ positioning. Thus, straightening the legs to a