Cassey Ho on Instagram: "MOBILITY CHECK! Can you do this? Try to do it without falling backward! This mobility challenge tests the flexibility and strength in your: ✅ shoulders ✅ thoracic spine ✅ hips ...and really challenges your core balance! I’m currently working on bringing my legs in a bit closer, toes more forward - which means I’m still on a core balance journey! I believe this mobility challenge was adapted from a form check for an overhead barbell squat which is performed in powerliftin