Adrenaline is the primary trigger and effector for fat loss, activated by various forms of movement.

“Adrenaline a.k.a. epinephrine is really the final common path by which movement of any kind, whether or not it's low-level shiver or whether or not it's lifting a barbell, sprinting up a hill, or doing a long bike ride, adrenaline is the effector of fat loss. It's the trigger and it's the effector.”