All learning takes place through the unification of body and mind. Within the realm of motor skill learning, the term mental practice has been used to explain this phenomenon. It has been found that individuals can use their imaginations to learn and to improve upon their performance. Mental practice can be used by teachers who have too little equipment and time, and many students. The following five principles of mental practice are particularly significant to the acquisition of motor skills: (1) The learner must have some prior experience with the task or a similar task; (2) The learner must be able to symbolize performance or movement by words and concepts; (3) The learner must be instructed in proper techniques of mental practice; (4) Mental practice is most effective when used in conjunction with physical practice; and (5) Mental practice sessions should not exceed five minutes if concentration is to be maintained. (JD)