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Re:When You Watch Sports, Your Brain Thinks You’re Playing by spydum on Sunday July 15, 2018 @02:37PM (#17536397)
If I recall it was about weight lifting and mentally visualizing the lifts in tandem with actual exercise. Pretty sure just thinking by itself did nothing. So, it was three way comparison (lifting alone, visualizing plus lifting, and just visualizing).

Edit: this is not that study but, along the same lines .. https://www.ncbi.nlm.nih.gov/pubmed/14998709/ pretty tiny sample though

Re:When You Watch Sports, Your Brain Thinks You’re Playing by fjsolwmv on Sunday July 15, 2018 @06:47PM (#17537525)
In general, visualization improves performance of ant activity.