Your body does not move as a stack of isolated parts, yet many workouts still train it that way. When stiffness, uncertain balance, or recurring irritation appears, another round of random stretches and ab repetitions can leave you with more rules but no clearer plan. Tigers Don't Do Sit-ups gives you an evidence-aware system for understanding whole-body motion and building strength that carries into walking, lifting, reaching, turning, and everyday life. You will learn how to test movement changes safely, adjust training dose, and keep useful options available without chasing a perfect posture. Inside, you'll find: • See movement as a task — understand how the nervous system coordinates joints around real outcomes instead of isolated anatomy labels. • Build from the ground — use foot contact, ankle motion, and walking mechanics to improve balance and force transfer. • Train adaptable hips — explore stance, rotation, squatting, hinging, and stepping without one-size-fits-all form rules. • Rethink trunk strength — connect pressure, breath, ribs, pelvis, resistance, and rotation beyond endless flexion drills. • Free the shoulder blade — learn why reaching, pressing, pulling, neck tension, and the rib cage belong in one conversation. • Use cross-body coordination — apply gait, counter-rotation, carries, crawling, timing, and responsible fascial models. • Control the training dose — progress range, load, speed, and complexity one variable at a time. • Respond wisely to pain — distinguish ordinary effort from irritability and warning signs that need qualified care. • Create a lasting practice — combine strength, locomotion, floor transitions, play, recovery, and flexible weekly planning. This book is for active adults, returning exercisers, movement coaches, and curious readers who want practical biomechanics without miracle claims. It supports informed training decisions but does not replace medical assessment or individualized rehabilitation. Start reading, choose one movement experiment, and build a stronger practice from what your body can safely learn today.