The alactic anaerobic system (ATP-PC) is the simplest energy system in the body with the shortest capacity (up to 15 seconds) to maintain ATP production. During intense exercises, such as sprinting, phosphates are the fastest and most available source of ATP. The main metabolic pathway for ATP regeneration during cardiovascular and endurance exercise is almost exclusively mitochondrial respiration (aerobic system), which initially shares the same metabolic pathway as the anaerobic process of glycolysis (aerobic glycolysis). Energy frameworks cooperate agreeably to deliver ATP. Through glycolysis, blood glucose and muscle glycogen (glycogen is the stored form of glucose in the muscle or liver) are converted into ' another chemical molecule called pyruvate, which, depending on the intensity of the exercise, will enter the mitochondrion (aerobic glycolytic system) or be converted into lactate (anaerobic lactation system). At exercise intensity levels below the anaerobic threshold, pyruvate enters the mitochondrion and muscle contraction continues through the aerobic production of ATP.

While at intensity levels above the anaerobic threshold the ability to produce ATP through mitochondrial respiration is impaired, and pyruvate is converted into lactate, which results as a byproduct of metabolism that is produced during the catabolism or energy use of carbohydrates. The metabolic pathways that support training intensity above the anaerobic threshold (i.e. the anaerobic systems) can sustain muscle contraction only for short periods, thus limiting performance. It is at this point that high-intensity exercise is compromised because the energy systems of glycolysis and phosphates that are supporting continued muscle contraction above the anaerobic threshold can produce ATP at a high rate. but I am only able to do this for a limited time. Hence, energy for physical activities requires a blend of all energy systems. Be that as it may, the determinants of the association of the specific energy framework are profoundly subject to the force of the activity.

Alactic anaerobic system
The alactic anaerobic system is primarily involved in an activity from one to 15 seconds. This metabolic pathway occurs mainly during maximal intensity exercises such as sprinting and low-rep weightlifting exercises (powerlifting, weightlifting).

Lactate anaerobic system
The anaerobic lactation system mainly intervenes in activity with a duration from 15 seconds to over 60 seconds, using the carbohydrates deposited in the muscle (muscle glycogen) resulting in the production of lactic acid and hydrogen ions. The accumulation of hydrogen ions creates a burning sensation and can be a cause of fatigue during exercise. The lactate anaerobic system predominates in physical activities close to maximal intensity, such as sprinting from 400 meters or exercising with weights at medium repetitions (6-20).

Glycolytic aerobic system
The glycolytic aerobic system intervenes during performances of a maximum duration of 20 minutes, resulting in an intermediate between the Lactaid anaerobic system and the oxidative aerobic system. In this case, the muscle primarily uses muscle glycogen and blood glucose to generate energy. This energy system is primarily used during activities such as 2-mile running on track and field.

Lipolytic aerobic system
The lipolytic aerobic system intervenes during performances lasting more than 20 minutes. In this case, the body uses fatty acids for energy. This is the energy system used during low-intensity aerobic activities. The lipolytic aerobic system is predominant in long-lasting activities such as the marathon in track and field.