Which exercise is typically contraindicated for participants with lower back issues?

Full sit-ups are typically contraindicated for participants with lower back issues because they involve significant flexion of the spine, which can increase pressure on the intervertebral discs and potentially exacerbate existing lower back problems. This movement can lead to discomfort or pain for individuals who already have compromised spinal stability or muscular imbalances in the core and back.

In contrast, exercises like planks, squats, and walking lunges can be performed with proper form and appropriate modifications to support core stability and strength without applying excessive strain on the lower back. It is essential for instructors to understand which exercises may pose risks to specific populations to ensure a safe and effective workout environment.