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.
Don't panic if you have a numb leg without any other symptoms, particularly if it goes away over time, as it is very unlikely to be caused by a tumor. However, it is possible that numb legs can be caused by a spinal tumor or a brain tumor. (Read about other unusual signs of a brain tumor.) A spinal tumor is a growth that develops in or near to your spinal cord and a brain tumor takes root in your brain - both can cause loss of sensation and numbness in the leg or legs. Other symptoms that accompany numb legs and may indicate a spinal tumor include back pain, decreased sensitivity to hot and cold, loss of bladder function, paralysis and spinal deformity.