Back-to-Back Chair Benefits: Strengthens quads and improves posture. How to Do It: Stand with backs touching; link elbows. Feel and match your partner’s breath. Press against each other’s back and walk your feet forward, keeping your sacrum and spine touching your partner’s, until you’re in a sitting position (no lower than 90 degrees). Hold the pose for 2 to 3 breaths; slowly return to standing. To Go Deeper: Carefully rise and lower repeatedly for an added strengthening challenge.