Lunge Peng

Focus Points

Leg closest to wall is up
Maintain constant pressure of ribs pressing into the yoga block (this is to prevent sideways leaning)
Actively press arm away from the wall at all times
Keep the arm straight and extend outward from the body strongly
Focus on keeping chest forward as much as possible (place hand on chest for feedback)
When arm is vertical, try to rotate palm towards ground by rotating through the shoulder without moving the hand backwards
If you lack the mobility to do the movement properly with a yoga block, simply move farther away from the wall or use a foam roller