also: steal a tip from the pros - when you do go to sit back down instead of moving your butt back to the sit - move the bike up to your butt. pushes you just that little further up the hill and you don't lose any forward momentum when sitting.
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"