I love the feel of heavy racquets and I've weighted mine up to about 12 oz, 6-8 pts head light. i've got a dunlop mfil 400 and a head titanium 5300. now i've only been playing for a year or so and i'm not in great shape (especially in regards to upper body strength), so i'm not sure if a 12 oz racquet is going to hurt my game at this point. it feels better now, but at the moment i just play for an hour at a time against people lik e me who don't really hit the ball hard. will i find them to be not maneuverable enough or too tiring when i start in on the low level tournaments? what kind of shape would i have to be in to use a 12 oz racquet for match play and what exercisees would i want to do to acheive that? thanks!