I used to do OMAD by accident because I was too lazy to make something to eat haha
However, I also did 16/8 intermittent fasting on purpose and it showed great effect.
I also used to be quite competitive regarding running. Tried to reach the club of sub 17: run 5km in less than 17 minutes. My record was 19 minutes. Was very interesting to notice that I consistently did hit 19 minutes with only +-3 seconds.
The numbers on the screen are good PoW.
So yes, I can relate.
Nowadays I'm dead just running for 20 minutes without caring about my speed, lol