Skeletal muscle is a muscle attached to one or both ends of the skeleton to form part of the mechanical system that moves the limbs and other parts of the body. The human body contains more than six hundred skeletal muscles, which make up forty to fifty percent of the total body weight. However, skeletal muscle performs three important functions that include: force generation for locomotion and respiration, force generation for postural support, and heat production during cold stress. The most obvious function of skeletal muscle is to allow an individual to move freely and breathe. Skeletal muscles are attached to bones by strong connective tissue called tendons. Muscles that reduce joint angles are called muscles that adapt to different aerobic exercises to become a more effective energy provider. It is important to know that regular resistance exercise has great benefits on people's overall health, including the prevention of diabetes, obesity and cardiovascular disease. However, muscles adapt to anaerobic and aerobic training. Chronic exercise provides stimuli for the body's systems to change. The systems will also adapt to volume, levels and intensity. There are several factors that influence training adaptations. Factors include genetic endowment, environmental factors, age, sex and fitness training status. With anaerobic metabolism, high-intensity, short-duration exercise comes primarily from stored phosphagens and adenosine triphosphate. Aerobic metabolism contains the most energy, more than fifty percent needed for sustained exercise lasting more than three minutes (Morton, RW2015). In some cases anaerobic training can elicit neural adaptation. Several neural changes with anaerobic training occur along the lower corticospinal tracts. Skeletal muscle adapts to anaerobic training mainly through hypertrophy, hyperplasia and the enhancement of its biochemical and ultrastructural components. Hypertrophy involves increased synthesis of the contractile proteins actin and myosin. However, motor units that contain type I or type II fibers are nevertheless more effective in eliminating plasma triglycerides, free fatty acids, and glucose. Resistance exercises increase mitochondria and glucose begins to be transported into muscles. Additionally, resistance exercises such as prolonged running increase the breathing capacity of the muscles. However, this adaptation includes increases in mitochondrial respiratory chain components (Agergaard, J. 2015). Muscle adaptation to aerobic exercise is similar to adaptation to strength training. While performing aerobic exercises, the number of mitochondria begins to increase. Not to mention, cardiovascular training increases the number of capillaries that carry oxygen to the mitochondria. With more fuel in their muscles, they can withstand longer periods of exercise, but the adaptations have their own different limits. Despite the length and intensity of a person's training, it is critical to understand that a person can reach peak efficiency in as little as four to five weeks. Physical training is also an adaptive process, and the body will begin to adapt to the stress of exercise with an increase in fitness above a moderate intensity threshold. To achieve greater effectiveness, always consider the factors involved in muscle adaptation to stress and deconditioning. The factors involved are specificity, overload, progression and