Stretching is the deliberate movement or positioning of a body segment so that a muscle-tendon unit and associated tissues are placed under lengthening tension. It can be performed actively, passively, dynamically or through combinations of these approaches. Static stretching generally involves holding a position near the available range of motion, whereas dynamic stretching uses controlled movement through a range without maintaining a prolonged end position. Ballistic stretching uses bouncing or rapid movements and can produce greater velocity at end range, while proprioceptive approaches may combine contraction and relaxation techniques. Stretching is therefore a broad category rather than one single exercise method.
Flexibility describes the available range of motion at a joint or series of joints, whereas stretching is one method that may influence that range. Mobility is a related but broader concept that generally includes the ability to actively control movement through available range. A person may possess passive flexibility without being able to actively control the same position, so flexibility and mobility should not be treated as identical. Range of motion is also joint-specific and influenced by anatomy, tissue properties, neural factors, temperature, previous activity and measurement method. These distinctions are important because increasing flexibility is not automatically equivalent to improving movement quality or physical performance.
Stretching can produce both acute and chronic changes. A single bout of static stretching can temporarily increase measured range of motion, partly through changes in stretch tolerance and partly through mechanical and neural factors. Repeated stretching over time can produce longer-lasting increases in flexibility, although the magnitude varies by muscle group, programme design and individual characteristics. Increased range of motion does not necessarily mean that muscles have physically become permanently longer in a simple mechanical sense. Changes in tolerance to stretch and nervous-system responses can contribute substantially to observed improvements.
Static stretching before exercise has historically been widely recommended as a general warm-up practice, but prolonged static stretching immediately before explosive or maximal-force activities can temporarily reduce performance in some circumstances, particularly when stretching is extensive. This is one reason modern warm-ups often prioritise general activity followed by dynamic movements relevant to the upcoming task. Static stretching can still have a place before or after exercise depending on the objective. The appropriate approach depends on whether the goal is acute range of motion, performance preparation, relaxation, flexibility development or another specific outcome.
Stretching can be used to address restricted range of motion when that restriction is relevant to a person's activities or movement requirements. For example, an athlete may require sufficient hip, ankle or shoulder mobility for a particular sport, while another person may simply want to maintain comfortable movement during daily activities. However, stretching is not universally required to prevent injury, and restricted flexibility is not automatically the cause of pain or dysfunction. Musculoskeletal problems are usually multifactorial, and a stretching programme should be matched to the actual limitation rather than applied indiscriminately.
Different stretching methods impose different mechanical and neurological demands. Active stretching uses the individual's own muscular effort to hold or move a limb, while passive stretching uses an external force or another body segment to assist the position. Dynamic stretching uses controlled movement and is often integrated into warm-ups. Proprioceptive neuromuscular facilitation approaches commonly involve alternating contraction and relaxation phases, although several protocols exist. Ballistic stretching uses momentum and rapid movement and may be inappropriate for people without adequate control or preparation.
Stretching has limitations when it is treated as a universal solution. Excessive force can aggravate tissues, particularly when the person is stretching into pain or attempting to exceed their current tolerance aggressively. Stretching may also fail to address a restriction caused primarily by joint structure, neurological factors or insufficient strength and motor control. In some situations, strengthening through an available range may improve functional movement more effectively than passive stretching alone. A comprehensive approach therefore considers flexibility alongside strength, coordination, tissue capacity and the actual movement demands of the task.
Stretching terminology is frequently used imprecisely, particularly when flexibility, mobility and warm-up are treated as interchangeable concepts. A warm-up is broader than stretching because it normally aims to prepare the body for subsequent activity through increased temperature, movement rehearsal and progressive intensity. Stretching can form part of a warm-up but is not synonymous with warming up. The practical value of stretching depends on the person's goals, the timing, the method and the specific tissues or movements involved.
