You're ... coming 'over the top' and hitting the outside of the ball.
By Brady Riggs
with David DeNunzio
Watching a major league slugger hit a baseball is an excellent visual for learning how to use your lower body to start your downswing. When an athlete like Vladimir Guerrero swings, you can almost feel his lower body pull his upper body into action. The secret to this move is in the left knee. As the pitch nears the plate, Vlad shifts his weight to the left and allows his left knee to rotate toward the mound. Of course, it can only rotate so far (the spikes on his left foot provide resistance), so at that point he straightens his left leg. Once this "post" is set, his hands and bat sling past it at breakneck speed.