Rich
I was only joking mate
My post was in no way intended to offend any back players, I know that most "larger" ballers have a sense of humour about this sort of thing, perhaps opitomised by Rob Yates' T-shirt:
I may be bigger slower and uglier than you, but I promise I will shoot you before you get there
Back players don't really have the need to play itty-bitty bunkers that front players typically have to, neither do they have the need for such rapid acceleration (required for muggings and fast break outs). This is not to say that these skills are useless as a back player, just that they are better suited up at the front.
A back players time would be better off used training other aspects of their game. Practicing things like re-potting while shooting, sweetspotting shouting loudly (actually a serious suggestion, if your front players can clearly here their back-man it makes one hell of a difference) etc.
Fitness wise, general fitness, strength etc rather than things like flexablilty and acceleration are important.
Richard