Originally Posted by
Lazyass
If you aren't feeling exhausted or overworked then you're not riding hard enough to get stronger. Go for the 30+ mile range your next ride, it's not that big a deal.
^^^^ This. If you want to get stronger, you have to stress the body. You get stronger when you're recovering from being sore/tired. You need hard days, active recovery days, and rest days. Otherwise, you're doing nothing except acclimating to the saddle