Three-part interval drill linking plank mountain climbers, high-to-low boat pose core work, and headstand mountain climbers (optional resistance band). Cycle through three rounds of 30 seconds on, 30 seconds off. Clear modification options for each exercise. **Benefit:** Builds shoulder and arm strength for inversions and vinyasa; sharpens core control for forward bends and backbends; develops confidence and stamina in headstand and arm balances.​​​​​​​​​​​​​​​​