One Legged Dog
Eka Pada Adho Mukha Svanasana
Extend upper leg, a firm point through the toe, wrap the outer hip down. Soft bend to the standing knee, heel lifted from floor. Push hands to flare sitting bones skyward and maintain the length in the spine.
Hollow out armpits (by externally rotating scapula and wrapping biceps down triceps up) to avoid dumping the chest. Notice the engagement of pecs and support to thoracic spine with this small cue.