Sorry, missed this question earlier. The first year as a prof is the toughest as everything is a new prep and you need to work on getting your research seeds planted, meeting the other faculty, and just learning how the university is run. On the plus side, I was able to swim on campus over my lunch hour every day. I also abused the treadmills quite frequently if I had a break. I did most of my riding right after work while my wife prepped dinner...which wasn't exactly the best arrangement but she somehow supported it! Things will open up more the second year and you will likely have a little more control of your schedule to be able to adjust training a bit. The hardest thing is getting to big races that require a lot of travel. Probable not best to be missing a bunch of classes on year 1!
Hope this helps.
Hope this helps.