Standard CPR is performed with the person in supine position. Prone CPR or reverse CPR is CPR performed on a person lying on their chest, by turning the head to the side and compressing the back.
Non-spinal structural causes of weak legs may include sacroiliac joint pain syndromes and piriformis syndrome. Non-sciatica related sources of weakness in the legs may include diabetes, peripheral neuropathy and various circulatory and neurological conditions.
Leg weakness should also not be confused with a muscle cramps or arthritis which cause a painful inability to move the foot or leg. Leg weakness also interferes with walking especially when it is involving the foot muscles. This is known as foot drop, in which a person unable to lift the foot upwards.