Sounds really unpleasant honestly. I pretty frequently eat only one insufficient meal/day or fully fast for non-health reasons and there's no getting around the

Sounds really unpleasant honestly. I pretty frequently eat only one insufficient meal/day or fully fast for non-health reasons and there's no getting around the fact that exercise on those days fucking sucks. If there's any benefit I can't see it being worth it except in extreme cases. Particularly endurance exercise without calories afterwards is one of the worst things you can do to your day.