Energy is defined as the ability to do work or cause motion. It has different forms like heat, light, sound, electrical energy, mechanical energy, and chemical energy. Metabolic processes in the human body use chemical energy. Adenosine triphosphate (ATP) is used as the source of energy for muscle contraction. ATP has high energy phosphate bonds and each bond stores about 11,000 calories. There are three energy systems for muscular contraction: a) Immediate energy system (Anaerobic System): Phosphogen system, b) Short-term energy system (Anaerobic glycolysis): Lactic acid system, c) Long-term energy system (Aerobic glycolysis). Football is the most popular sport in the world. It is categorized as intermittent exercise (frequent periods of intense work followed by periods of less-intense recovery). Top level players travel approximately 11 km in a 90 minute match. The exercise intensity is reduced and the distance covered is 5–10% less in the second half. Football is mainly dependent upon aerobic metabolism. Aerobic energy production accounts for more than 90% of the total energy consumption. The average work intensity is close to the anaerobic threshold (normally between 80–90% of HRmax in football players). In football there are periods of high-intensity activity where accumulation of lactate takes place. There is a sprint bout every 90 seconds, lasting 2–4 seconds. Sprinting constitutes 1–11% of the total distance covered during a match, corresponding to 0.5–3.0% of effective play time. Anaerobic episodes constitute a small part of the match, but are very crucial. During recovery, oxygen uptake remains elevated. If recovery periods are relatively short, VO2 remains elevated and the aerobic contribution to ATP resynthesis increases. There are no published data about the energetics of amputee football. The following assumptions can be made: slow and fast episodes of amputee football are slower than regular football; the energy needed to accomplish the same task is higher in amputees; the energy profile is similar.