Steps: 

• Stand with your back flat against the wall, keeping your feet a few inches ahead of you. 
• Slide down until your knees are bent like you're sitting in an invisible chair. 
• Keep your knees above your ankles in an L shape and hold the position for 10 to 30 seconds. Squeeze the muscles in your thighs and your bottom.
• Slowly slide back up. Rest and repeat 3 times. 
• As your leg muscles get stronger, see if you can do the wall sits for more seconds each time you do the exercise.