Have you ever been in a situation like:

I only can exercise at X hour today, but I failed to eat in time, if I eat now, my stomack will not be empty at hour X, if I don't eat I will be too weak at hour X, I am skipping exercise today.

Try this and see what happens: don't eat, drink lots of water, and 20 mins before exercise take 2 tablespoons of honey and 2 tablespoons of virgin coconut oil.

You can adjust number of spoons slightly dependent on your muscle weight and calories needed for your exercise.