Which exercise emphasizes lateral flexor strength?

The exercise that emphasizes lateral flexor strength is Side Lifts. This movement specifically targets the oblique muscles, which are responsible for lateral flexion of the spine. When performing Side Lifts, individuals engage these muscles as they lift their body away from the mat while maintaining balance and control. This not only strengthens the lateral stabilizers of the spine but also enhances overall core stability.

Other exercises listed may involve core engagement but are focused on different muscle groups or movements. Back Extensions primarily target the muscles of the lower back and focus on extension rather than lateral movement. The Spine Stretch encourages forward flexion of the spine, focusing on the lengthening of the back and hamstrings, rather than lateral strength. The Single Leg Stretch primarily engages the abdominals and hip flexors, emphasizing coordination and control rather than lateral flexor strength. Thus, the Side Lifts uniquely focus on developing the muscles necessary for lateral flexion, validating it as the correct choice for this question.