doughnut
Veteran
I have a similar thing every year. As winter approaches I stop cycling outside and go to the gym where I can do 45 minute spinning classes. Then as spring comes along I head out onto the roads again. However, for the initial few weeks in the spring my body starts complaining at about the 1 hour mark, since I have spent the last 4-5 months stopping at 45 mins. 2-3 weeks later its all back to normal where I can just keep going forever as long as I have something to eat every 25 miles or so.