Which exercise involves extension of the torso that may excessively load the lumbar spine?

The exercise that involves extension of the torso and may excessively load the lumbar spine is back extension. In this exercise, the focus is on extending the spine in an arched position, which can potentially lead to excessive loading on the lumbar region if not performed with proper technique or adequate spinal mobility. This is particularly important because the lumbar spine is designed to maintain a neutral position to prevent undue stress, and excessive extension can compromise this alignment, leading to discomfort or injury.

Rocking is a dynamic exercise that focuses more on core engagement and coordination rather than creating excessive extension. Swivel involves rotation, which does not primarily emphasize lumbar extension, while the Hundred is focused on achieving core stability and endurance without significant spinal extension. Therefore, understanding the mechanics and potential risks associated with back extensions in Pilates is crucial for maintaining spinal health during these practices.