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.
Vitamin D Deficiency. If your legs feel tired and weak, it could be a sign of vitamin D deficiency, according to the American Journal of Clinical Nutrition. A vitamin D deficiency can cause your legs to feel heavy, tire easily and experience general muscle weakness. Your body can make its own vitamin D from exposure to sunlight.