Which exercise could be contraindicated for a client with a lower back issue?

The Swan Dive is considered contraindicated for a client with a lower back issue because this exercise involves significant extension of the spine and can put excessive strain on the lower back. The movement requires the client to lift their torso and legs off the ground while maintaining a curve in the spine, which can exacerbate existing lower back problems or cause discomfort. In contrast, the other exercises listed typically allow for a more neutral spine position or offer variations that support the lower back, making them more suitable for individuals with lower back issues. Keeping the spine in a safe alignment is crucial in both rehabilitation and core strengthening, especially for clients with a history of back pain.