My problem with IF is that I need energy in the morning because of bicycle commute, and I also want to have a warm meal in the evening after I come back from work. This could only work if the feeding window was 10-11 hours wide.
Try biking harder/longer so that you use up all your blood sugar and convert your metabolism from glycogen to ketones.
Going on an hour or longer run is part of my secret to extended fasting. Exercise-based switching of your metabolism makes the first and second day of fasting NOT suck so bad.
So that's literally the opposite of your assumption, that the exercise makes you "need energy." If your like 99% of people, you already have plenty "energy" throughout your body.
What are you actually experiencing?
Blood sugar withdrawal. Your "need" for energy is actually a craving for the high glycemic ingredients in your food that cause physical addiction like symptoms, like feeling "hungry." And you may find it surprising that "hunger" isn't one of the things people experience on an extended fast when properly hydrated.
Your "need" is easing the pain of withdrawal. Not anything to do with "energy."
Edit: my SO informed me that there are some situations where woman benefit from certain foods after exercise for hormone regulation. But she also concurs that the evidence is pretty clear that men were built for intermittent fasting.
Unless you have some metabolic disorder, after your hour+ run your blood glucose is still going to be within, maybe on the low end of, the normal range. Even if you've completely depleted your liver of glycogen, which is unlikely for anything short of marathon distance unless you were already low. If your blood sugar was low (never mind gone) you'd be in serious trouble, dead before long if not rectified.
Your body doesn't run out of energy that fast, we've just became very used to over feeding
Not trying to say exercising isn't worth while, it is but using it as the sole means of weight loss isn't fruitful gotta change the diet as well.
STRENGTH TRAINING FIRST!
If you only do cardio, ie bike and run, then you are actually WORSE OFF.
Calories burned is directly proportional to muscle mass!
Air squats. Pushups. Crunches. Ten of each of those a day. It can be done in 60 seconds. 10X that and you'll be shredded without running or cycling a day in your life.
Anyway, exercising is always necesary to keeping muscular mass.
IF including 2-week (water-only)fasts during a 3-year period had no noticeable benefits besides 10-20 pound drops at the start. (Keto-only on & off provides brief weight loss.)
My point, "decent" exercise doesn't guarantee weight loss.
If I were starting IF while hiking every day, I would probably have snack in the morning at first but reduce and then eliminate it.