If you want to burn fat you need anaerobic respiratory activities, which would be an activity like walking at 50-60% max heartrate. Aerobic activities burn glycogen/ATP stores primarily over fat stores which take time to break into. Fat cannot be utilized fast enough for such activities.
I lost 3/16" off my waist from the previous mornings reading after a 65 minute walk with my dog last night, and having used 50mcg T3 that morning. I also had pizza that same night.