Originally Posted by
berner
As a young man in y early 20s, I did construction work for my uncle who was a general contractor. I found my left side, both arm and leg, was stronger than the right side. This is likely due to me being left handed. It could be the same for you. Then again, there could be a structural imbalance elsewhere such as in your back or hip. My main suggestion is to develop awareness as to how you sit on the bike. Maybe have someone take some video of you riding, both a side view and a rear view.
I was wondering this myself. I tend to use my right side harder as it is my dominate side. So maybe a little self awareness can do wonders. I do know on my ride I had the fatigue diminish at times and come back later. Maybe I forced myself to relax more and later on tensed up again.