not fair to say old age! maybe what is associated with old age,
I know emotional state plays havoc with fitness, ie stressed (work and minor daily events), moving flat , women !! getting enough sex
so you are drinking well Toks
have you changed you training routine? I think Marek is spot on with the metabolism, I definitely feel better (stronger) sometimes when riding under duress (ie with load)
its always difficult to flip between speed and distance
Dr. Simon recommends even more discipline, harder training dude!! but remember
less bike = more smile!