There is actually some reason to believe that imagining can increase the strength, for example this study: https://web.archive.org/web/20170814100324/http://jn.

There is actually some reason to believe that imagining can increase the strength, for example this study: https://web.archive.org/web/20170814100324/http://jn.physiology.org/content/67/5/1114 https://web.archive.org/web/20170814100324/http://jn.physiol...