I started riding last September and of course noticed immediate and pretty quick improvement, but now things have slowed down. At one point i had convinced myself that I was going to try and do a few amateur races, but that seems to be way beyond my current ability. Is it reasonable to expect that if i went from pretty sedentary in September and have been training 4-8 hours a week i'd still be stuck at 17-18 mph tops over 10 mile stretches at LT, or should i think about changing my training up a bit? How long does it take usually to go from out of shape to cat 5 competition fitness? I'm 29 BTW and not overweight but probably am carrying around 5-10 pounds I could lose.