As a kid, I used to play ball outdoors around 7am right after sunrise for 2 to 3 hours while fasting then crash until sunset lol No way I can get away with that now.
However, I made a habit of continuing to workout during Ramadan. I don't do anything crazy, no cardio, but just maintaining. 100 pushups daily, 50 chinups, and 12 mins of core workouts. Plus as opposed to years prior where I would go ham when I break my fast, I now keep my meals light, balanced and not much sugar/ fried foods. I'm finally losing the love handles that just wouldn't go away during the pandemic.
That being said, you would be surprised what your body can adjust to. I've balled outdoors while fasting in the afternoon and it really depends on how you take care of your body. It's not as bad as you would think. Day 1 or Day 2 may be tough because of the adjustment period so Kanter was smart that he fasts 1 to 2 times a week year round.