Originally Posted by
MikeyBoyAz
I think what he is talking about ( I have experienced this too ) is the effect of how much you lean over... visualize how far your butt sticks out when you bend over... by trying to bend over with your heels against a wall... you can't... (I can't) so when you rump moves back the balance goes more over your feet, you may lean over, but less forward... hence moving your seat back to essentially move your feet forward relatively... this allows less pressure on your hands ( yes pros?)
Not sure if you are talking about this, but there's an effect that you get with a good cadence and the right balance. You hands seem to have less burden because your fast spinning legs levitate your upper body somewhat. So you don't have a death grip on the bars.
Of course, in winter or rough conditions, this doesn't work as well.