There are two theories about why imagery and rehearsals in the mind are effective:
1. Neuromuscular theory proposes that visualization activates the same motor pathways as if the skill were physically performed, but at a sub-threshold level. Studies using EMG equipment have demonstrated this activation, which is comparable to physical movement but at a lower level.
2. Cognitive theory suggests that imagery speeds up the acquisition of mental elements required for the performance of a skill. The athlete can also devise strategies and test solutions without the risk of injury or fatigue.