I agree with the sentiment of the statements here. It is about having fun. Most people don’t stick with an exercise regiment because it is mentally stressful. Riding a bike is fun. Even on days on I am tired or run down and I do chill on my ride, my heart still gets up and my muscles are taxed. Maybe not to the max but I am getting something. The next time I ride instead of some mental pressure or remembering how much I hurt from going hard last time, I am relaxed and excited to be on the bike. Enjoy the ride, fitness is this great bonus to riding.