Sphinx Pose 
Muscles: Rectus abdominal, pectoralis minor 

1. lie on your belly on your mat 
2. lift up to your forearms aligning your shoulders over your elbows fingers pointing forward 
3. keep the tops of your feet pressing into the mat and your tailbone lengthening toward your heels as you press you forearms down into the mat. Energetically pull your elbows back and push your chest forward
4. keep your shoulders down and away from your ears and keep your gaze forward
5. hold pose for 5 to 10 breathes and relax your chest 

Modification: Perform cobra pose
Safety Tip: keep a slight engagement of your core to protect your lower back