Hello,

Thanks for the question. There is a lot of debate as to what the exact percentage of your maximum heart rate should be for optimal fat burning. At lower intensities there have been studies showing a higher amount of fat tissue being burned and at higher percentages we have seen more calories being burned. These numbers have varied from 60-85%

With that said, modern science has shown that interval training is the best method for burning fat. High Intensity Interval Training. Take a look at our recent post.
http://getfitjourney.com/reader-questions/one-of-the-best-ways-to-burn-fat-hiit-high-intensity-interval-training/

With interval training, your heart rate fluctuates so you aren't at a single constant rate.

If you're looking to drop the fat, go with HIIT.

Thanks for the great question!