The next major event in sports psychology was an idea known as transfer of training. Transfer of training happens when you exercise one arm or one side of the body to make it stronger and the other side also becomes stronger without having any exercise. This area was first studied by Walter Wells Davis in the late 1800s. Davis ran an experiment that involved having people lift weights with one arm and not the other. His results proved the theory of transfer of training. William G. Anderson also studied this concept. In his experiments he found that people who squeezed an object on one side of the body also got stronger on the opposite side of the body.