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.
Iron Deficiency. Not getting enough iron can make your legs feel tired, HelpGuide.org reports. An iron deficiency can cause restless leg syndrome, or RLS. One of the symptoms of RLS is a tired and heavy feeling in your legs. This predominantly happens when you lie down or rest, and usually only affects you during bedtime, but it can occur much earlier in the day depending upon your deficiency.