Make sure your back is flat against the wall.
Place your feet firmly on the ground, shoulder-width apart, and then about 2 feet out from the wall (dependant on limb length)
Slide your back down the wall while keeping your core engaged and bending your legs until they’re in a 90-degree angle—or right angle, so that if someone wanted to sit on your lap, they could.
(Although now probably isn’t the best time.) Your knees should be directly above your ankles, not jutting out in front of them.
HOLD your position, while contracting your ab muscles.
When you can’t take any more, take a few seconds to slowly come back to a standing position while leaning against the wall (don’t just crumple into a heap on the floor)
Arms against wall
Arms in front