I commute to work on my bike, not very far just a bit over three miles each way. I record each ride for fun just to see if I'm getting any faster. A few weeks ago I was closing down and had to go pee fairly bad, but decided to try and experiment and held my pee until I got home in order to see if the pressure on my bladder would encourage me to ride faster. The average moving speed on my way home for the week before was 14.8 mp/h with the lowest average moving speed ride being 14.5 mp/h and the highest being 15.3 mp/h. On the day with a full bladder my average moving speed was 15.7 mp/h and I had a road closure that detoured me an extra quarter mile, so even with a ever so slightly longer ride I absolutely crushed it on my way home. I decided that with my short commute the extra few seconds I shaved off my ride wasn't worth the discomfort so I did not continue the experiment to get better data.