Quesiton about calories burned

miss_melissa_

I attend an 30 minute very intense boot camp, 3 times a week. When I started using MFP I recorded it as 30 minutes of circuit training. At that time, the website would calculate me as burning 274 calories for 30 minutes. Now I am 25 lbs lighter and burn 300 calories in 30 minutes. Why is that? I thought the lighter you are, the less you burn...please let me know

marianne_s

The best way to know for sure, is to wear a heart rate monitor.