In brief, here is a summary, taken from here: http://www.jonathanfields...gth-fitness-weight-loss/
Full full details, see here: http://westallen.typepad....r_matter_shackell_07.pdf
Building muscle, it turns out, is not nearly as mechanical as we thought. And, in fact, a recent study by Erin M. Shackell and Lionel G. Standing at Bishop’s University reveals you may be able to make nearly identical gains in strength and fitness without lifting a finger!
That study measured the strength gains in three different groups of people. The first group did nothing outside their usual routine. The second group was put through two weeks of highly focused strength training for one specific muscle, three times a week. The third group listened to audio CDs that guided them to imagine themselves going through the same workout as the exercising group, three times a week.
And, the results blew everyone away.
The control group, who didn’t do anything, saw no gains in strength. The exercise group, who trained three times a week, saw a 28% gain in strength. No big surprises there. But, the group who did not exercise, but rather thought about exercising experienced nearly the same gains in strength as the exercise group (24%). Yes, you read that right!
The group that visualized exercised got nearly the same benefit, in terms of strength-gains, as the group that actually worked-out.
So if people can get those sort of results without doing anything at all, it makes sense as to why visualized training would work.