Hi all. I've been reading and applying a lot of the biomechanics that tricky, wil and BB have been advocating. One of them, esp in FYB, was the pivot and shoulder turn after the split step. Today after a short break from tennis, i was again out on the courts hitting some balls from the baseline. At the start my balls were landing service line short, and i couldnt figure out why. I was bending my knees, i was hitting through the ball and everything seemed right. But then i realize that after split stepping and bending my knees, i would immediately seperate my hands from the racket during the shoulder turn, instead of seperating my hands from the racket AFTER the shoulder is completely turned (shoulder under the chin). After making this adjustment, i was hitting the forehand a lot deeper and there was more spin. My question is, why does such a seemingly small detail have such a huge difference in the quality of the balls produced? It'd help if you guys can enlighten me in simple layman terms as i'm not too familiar with biomechanic jargon like the kinetic chain etc. Btw, i'm using a semi wester grip.