Just Imagining a Workout Can Make You Stronger

Motor imagery - the felt, internal rehearsal of moving the body - uses many of the same brain systems involved in actual movement. The key difference is that inhibitory signals prevent imagined movement commands from reaching the muscles. This overlap helps explain why mentally practicing an action can improve performance: imagery can raise heart and breathing rates, and studies find benefits in tasks that depend on planning and precision. Surgeons who rehearse procedures in virtual reality perform better than those who do not, while golfers who imagined sinking a putt made 30.4 percent more successful putts than golfers who skipped the mental rehearsal.

The effects can extend beyond skill-based activities to muscle strength. Exercise scientist Guang Yue found that people who imagined training a small finger muscle increased its strength by 22 percent, compared with a 30 percent increase among those who physically trained it. Mental practice is most useful as a complement to physical exercise, not a replacement: imagined workouts cannot supply real-world feedback or fully reproduce the demands of moving. A review of studies found that about 20 minutes is the most effective length for a mental practice session; shorter or longer sessions produce less reliable results, perhaps because concentration fades or feedback is missing. The broader point is that the brain’s partial response to imagined movement can produce measurable physical and performance gains.