Thanks for posting those fotos on pronation. I totally forgot about that in my 30 year layoff from competitive tennis, and your 3 pics got me pronating again.... Today, went out to the courts and served close to my best of 1978, increasing my service speed AND getting more consistency too boot. Honestly, old age, alzhimer's, and fading brain working on iboprofen got me thinking my first flats can now only go about 105 or so. With those 3 pics in mind, easy low 120's again, the percentage going in easy half better, giving confidence to swing out on the first flats. I played with the 3 guys who went up against #2Harvard's serves yesterday, and they said mine was right there in pure speed, but I can't come close to backing it up, of course. I'm not anywhere near 5.5. THANKS AGAIN and I hope you all get the pronation and let's raise our game levels !!