In the field of sports, image training has been actively used for improving an athlete’s performance. Several prior studies on image training have focused on mental training, including methods to improve an athlete’s psychological capabilities (reducing tension, nervousness, and anxiety and improving motivation). Several reports state that repeated practice of image training successfully improves an athlete’s performance. However, to the best of our knowledge, no effective and standardized image training program has been developed to date. It is known that image training induces activation of the brain sites that are known to be activated during actual athletic activity. Motor imagery (MI) and motor execution (ME) share a similar neural mechanism, and Jeannerod proposed the concept of functional equivalence between MI and ME. Several prior studies have demonstrated activation of the cerebral cortex and subcortical areas (that form neural networks for ME) during MI. The motor-related regions of the cortex are the supplementary motor area (SMA), ventral premotor cortex (vPMC), dorsal premotor cortex (dPMC), and primary motor cortex (M1). These regions are closely connected via feedback loops to the cerebellum and the cerebral basal ganglia, resulting in their activation during both MI and ME. The parietal lobe is another region involved in both MI and ME. The parietal lobe shows increased activity correlating with the increase of spatial task requirements during MI.