I've been working out regularily for a few weeks in an attempt to lose weight. I've been getting on cardio machines for 30-40 minutes 5 days a week. I want to lose weight as I weigh 250 at 6'3" and I have been using the cardio option on the machine which says I need to maintain 158bpm throughout the routine. There is also a fat burn option which I don't use because it wants me to maintain only 120bpm which I cannot do because I can't stand going that slow on the machine. Is the lower bpm going to really make me lost weight faster?