Strength is recognized as the ability to exert force, typically measured in the amount of weight a person can lift or manipulate. There are five broad categories of strength, each with its own special training requirements: absolute, limit, speed, anaerobic, and aerobic.  There are many factors that influence strength.
- Structural/Anatomical - muscle fiber arrangement, musculoskeletal leverage, ratio of fast vs. slow-twitch fibers, tissue leverage, scar tissue and adhesions (motion-limiting factors), elasticity, intramuscular/intermuscular friction, etc.
- Physiological/Biochemical - stretch reflex, Golgi tendon organ sensitivity, hormonal function, energy transfer systems efficiency, extent of hyperplasia, myofibrillar development, motor unit recruitment, cardiovascular and cardiorespiratory factors, etc.
- Psychoneural/Learned Responses - arousal level, pain tolerance, level of concentration, social learning, skill level, spiritual factors, etc.
- External/Environmental - equipment, weather, altitude, gravity, opposing/assisting forces, etc. 
Muscular strength is a general component of fitness. Strength level should only be to a point where the increased strength will not interfere with technique execution. When excessive amounts of strength are developed, range of motion, and speed of execution is decreased and coordination usually deteriorates. Thus, it becomes increasingly important to keep all of these factors well balanced.