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.
Many people suffering from jelly legs worry that they are experiencing some type of health problem. After all, weak legs can be a scary feeling - it may feel as though you can't stand, and that may cause your mind to race as you worry that something is wrong. If you feel frightened, talk to a doctor. Only a doctor can diagnose any underlying health issues.