linguistic:voice_change, structural:reformatting
Technique and training

Unlike other throwing events, javelin allows the competitor to build speed over a considerable distance. In addition, the core and upper body strength is necessary to deliver the implement, javelin throwers benefit from the agility and athleticism typically associated with running and jumping events. Thus, the athletes share more physical characteristics with sprinters than with others, although they still need the skill of heavier throwing athletes.

Traditional free-weight training is often used by javelin throwers. Metal-rod exercises and resistance band exercises can be used to train a similar action to the javelin throw to increase power and intensity. Without proper strength and flexibility, throwers can become extremely injury prone, especially in the shoulder and elbow. Core stability can help in the transference of physical power and force from the ground through the body to the javelin. Stretching and sprint training are used to enhance the speed of the athlete at the point of release, and subsequently, the speed of the javelin. At release, a javelin can reach speeds approaching 113 km/h (70 mph).

The javelin throw consists of three separate phases: the run-up, the transition, and the delivery. During each phase, the position of the javelin changes while the thrower changes his or her muscle recruitment. In the run-up phase as Luann Voza states, "your arm is bent and kept close to your head, keeping the javelin in alignment with little to no arm movement". This allows the thrower's bicep to contract, flexing the elbow. In order for the javelin to stay up high, the thrower's deltoid flexes. In the transition phase, the thrower's "back muscles contract" as "the javelin is brought back in alignment with the shoulder with the thrower's palm up". This, according to Voza, "stretches your pectoral, or chest, muscles. From there, a stretch reflex, an involuntary contraction of your chest, helps bring your throwing arm forward with increased force". During the final phase, the rotation of the shoulders initiates the release, which then "transfers movement through the triceps muscles, wrists and fingers to extend the throwing arm forward to release the javelin".