Nice to make your e-acquaintance. Counter-example: Fasted the last couple of years in a -20% calorie deficit. Did nap during the day, but then worked out right before iftar (dinner). It's not an uncommon regimen. Just like anything else with a n of 500M (+/- 200M depending on number of adults and sick/elderly), it's hard to make a generalization.

Personally though, it went fine in terms of productivity and energy. Trying to work out without that nap was pretty brutal but fasts are long enough to fit it in after work.