I have been doing cardio 3-5 days a week for 30 min in the morning on an empty stomach. My first question is, for this amount of cardio, I have been using the multiplier of 1.55 for BMR. Is this relatively correct? Second, I am now going to step up the cardio to 5-7 days a week at 45-60 minutes in the am. Should I use 1.725, or 1.9 for multiplying my BMR?