Motor imagery is an effective training technique for motor learning facilitating brain plasticity. This hands-off technique has its origin in the field of sports psychology and gained wide interest in the field of rehabilitation. In this mental process, movements are simulated in the mind›s eye without actively performing these movements. In combination with physical practice motor imagery helps to practice and consolidate motor functions without physical exhaustion. The technique is easy to learn and produces significantly better results than active physical practice only. In this guest lecture, questions regarding WHY is motor imagery working, WHEN, WHERE, and HOW can I use motor imagery with my patients, and WHAT assessments can I use to evaluate my patients› motor imagery ability will be discussed.