Do you constantly yank on your hamstrings only to have them feel tighter an hour later? In this post, Dr. Justin Lin breaks down why constant hamstring tightness is often a "protective tension" response from your nervous system, not a flexibility issue. Discover why classic toe reaches strain your lower back and sciatic nerve, how neurodynamics change the game, and learn a safer, PT-approved hamstring stretch protocol that protects your pelvis and spine.