The physical training group increased their hip flexor strength by 36 pounds (28.3%), while the control group increased their strength by only 6 pounds. But what is surprising is that the mental training group increased their strength by 32 pounds (23.7%) -- almost as much of an increase in strength as the physical training produced. And both the mental and physical training groups reduced their systolic blood pressure and pulse rate. The complete study was published in Erin M. Shackell & Lionel G. Standing,"Mind Over Matter: Mental Training Increases Physical Strength," North American Journal of Psychology, 2007, Vol. 9, No. 1, 189-200.