At the end of the study, the scientists compared their findings. The first set of participants had their finger strength tested against the control group. A nobrainer, right? Of course, the group that did the actual exercises exhibited 30 percent greater finger strength than those in the control group. We all know that if we put a load on a muscle and do so repeatedly, we are going to increase the strength of that muscle. What we probably wouldn’t anticipate is that the group who mentally rehearsed the exercises demonstrated a 22 percent increase in muscle strength, simply by doing the
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