Work that core!Upward facing boat is great for strenghtening the core and back. Also enjoy Ardha Navasana( knees bent, calves parallel to the floor), modified boat as an option. **Lower back pain yogi’s this is not for you! Put your spine to the floor if you have lower back pain, raise the legs and bend the knees, then lift up head, neck and shoulders. Reach forward and hold that core!