Jump
Overview
Jump is a basic human movement in which the muscles of the lower limbs generate force to push off the ground or a platform and lift the whole body into the air. Beyond a simple means of locomotion, it has developed into a core skill that decides victory or defeat in numerous sports, including jumping events in athletics, shooting and rebounding in ball games, and aerial techniques in winter sports. Today, it is a subject of research in biomechanics and sports science, and is also used as an important indicator in rehabilitation medicine and aging research.
Main Content
Biomechanical Principles
The physical essence of jumping is ground reaction force. When an athlete applies force downward, the ground pushes back with equal magnitude, and the moment this force exceeds body weight, the body leaves the ground. Jump height is broadly determined by the following factors.
- Lower-limb strength and power: explosive contraction capacity of the quadriceps, glutes, gastrocnemius, and soleus
- Stretch-Shortening Cycle: a neuromuscular mechanism that reuses the elastic energy of muscles and tendons immediately after landing
- Upper-limb swing: swinging the arms upward generates angular momentum and raises jump height by more than 10%
- Body composition and technique: body fat percentage, approach speed, takeoff angle, etc.
In other words, jump height depends not on simple muscle strength but on how quickly and efficiently force is transmitted to the ground.
Jumps in Sports
Athletics jumping events: high jump, long jump, triple jump, and pole vault are representative. In the high jump, records improved dramatically after Dick Fosbury introduced the back-style jump (Fosbury Flop) in 1968, and in pole vault, as pole material changed from bamboo to fiberglass and carbon, entry into the 6 m range became possible.
Ball games: jump shots and rebounds in basketball, spikes and blocks in volleyball, and saves by soccer goalkeepers are representative examples in which vertical jump ability determines performance. In volleyball and basketball in particular, maximum jump height is used as a key indicator in player evaluation.
Winter sports: In ski jumping, takeoff speed on the ramp and aerodynamic posture (V-style) determine flight distance, and figure skating jumps are classified into toe loop, salchow, lutz, flip, axel, etc., according to the number of rotations.
Dance and gymnastics: Floor exercise, trampoline, breaking, and others make jumping a core element of artistic expression.
Training Methods
Training to improve jumping ability is broadly divided into three strands. First, maximum strength training that builds basic strength through squats, deadlifts, and the like. Second, improvement of neuromuscular recruitment through plyometrics such as box jumps and squat jumps. Third, technique training that corrects landing posture and knee alignment. Recently, quantitative training using wearable sensors and force plates that measure landing impact has become widespread.
Injury and Safety
Jumping is a high-risk movement in which the knees and ankles must absorb impact reaching 3 to 8 times body weight at the moment of landing. Anterior cruciate ligament (ACL) tears, Achilles tendinitis, and jumper's knee are representative injuries, and it is reported that the ACL injury rate is relatively higher among female athletes. Sufficient warm-up, maintaining knee flexion on landing, and gradual load progression are key prevention principles.
Measurement and Records
Vertical jump height is generally measured by the Sargent jump (standing jump) and approach jump. The difference between SJ (Squat Jump), performed from a squat position without countermovement, and CMJ (Countermovement Jump), which uses countermovement, is used as an indicator for assessing neuromuscular fatigue and the ability to use elastic energy. The CMJ of an average adult is around 30–40 cm, while elite basketball and volleyball players reach 70–100 cm.
Recent Trends
The biggest change in the field of jumping in 2024–2025 is the popularization of data-driven training. As apps that analyze jump height and landing impact using only a smartphone camera have come into wide use, amateur athletes and the general public can now receive professional-level feedback. In addition, AI pose estimation technology detects knee valgus and left-right asymmetry in squat and jump movements in real time and is being used for injury prevention.
In sports settings, auxiliary training tools such as weighted vests, resistance bands, and electrical muscle stimulation (EMS) for improving jumping power have spread, and in winter sports, aerodynamic simulation in ski jumping and competition over quadruple jumps in figure skating continue. In the field of aging research, the rate of decline in jump height after age 40 is drawing attention as an indicator predicting sarcopenia and decreased bone density, and attempts are underway to incorporate it into health checkups for older adults. Meanwhile, in esports and fitness games, rhythm games and VR content that use actual jumping movements as input are increasing.
Related Topics
- [[Athletics]]
- [[Basketball]]
- [[Volleyball]]
- [[Ski jumping]]
- [[Figure skating]]
- [[Biomechanics]]
- [[Plyometrics]]
- [[Anterior cruciate ligament]]