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.
1 Not drinking enough water can also cause your body to become weak and lowers your metabolism. 2  If you experience leg cramps you will feel the pain of aching legs for at least one or two days.  Standing or sitting with the wrong posture can lead to additional strain on your lower back and limbs causing achy legs.