[itchyouch]

Semi-strenuous exercise to deplete available glucose, immediately followed by fasting.

Cardio works well for this. Options aren't limited to running. Speed walking or slow walking at a 5-15% incline on a treadmill for some amount of time can achieve the necessary glycogen depletion.

Consuming coconut milk as a fat source with its high level of medium chain triglycerides also generates more ketones per fat ingested then other fat sources

Since glycogen storage requires lots of water, losing 1-5lbs in water weight after exercising is a good sign that the glycogen stores have been depleted enough for the body to start looking for other sources of energy. One should be able to hit the scale, go exercise and sweat a ton, then go back to the scale 30mins to an hour later and see the water depletion. For myself I will hit the treadmill walking at 15% incline @ 2-4mph for 45mins to an hour while profusely sweating from the 3min mark till I stop.

[DrScump]

Low-intensity exercise uses free fatty acids, not glucose/glycogen, as its primary fuel.

[voidlogic]

This is not a binary thing, as intensity increases the substrate gradually shifts from FFAs to glucose. If one has been starving, fasting or eating very low carb for a while, the muscles will also use ketone bodies in place of glucose.