The biomechanics FLEXIBILITY vs STRENGTH REALITY 1. LIGAMENT LAXITY: Ligament yang loose = joint stability berkurang Range of motion tinggi tanpa muscle control = risky 2. PASSIVE vs ACTIVE FLEXIBILITY: Passive: bisa masuk pose extreme dengan bantuan gravity/prop Active: bisa masuk pose extreme tanpa bantuan, dengan strength Yang healthy = active flexibility 3. HYPERMOBILITY SPECTRUM: ~15% populasi (higher in females + Asian descent) Bukan berka