Originally Posted by
MK313
If you are just starting to commute by bike, you may want to do it only a few times a week, especially if you are physically drained from doing it. If I were you, I'd ride twice a week the first week to give yourself time to adjust. Maybe ride Mon & Friday (if you don't work weekends). Then once you feel good riding both days, add a Wed ride. Once that becomes doable, then add one more day & then a fifth day. Biking takes effort, especially if you aren't used to it & are already doing a lot of physical labor.
+100
Going gung-ho on anything will make you hate it. Work yourself up to it. MK313 is definitely right about that. Also, since you have a labor-heavy day, make sure you are eating appropriately and drinking as much water as you can. Sleep is super important and will make you feel 100x better if you are sleeping poorly now.