Cardio Energie

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So for all you healthy people!
Starting January 5th i started going to the gym… I have been doing Cardio on the cross trainer about everyother day or 2x per week (never exercise on the weekends)
So im 27 and weight 130.. that means my BMI shold be 220-27= 193….{ the very tip top!}
I have been doing about 188-190 bmi (ALL THE TIME)
2.10 miles…. 600 calories… breathing hard…. 45min

Now today I did a test…: I went SLOWER~
174-lowest (177-180) 182-highest BPM
2.20 miles…. 600cal…. 45 min… not out of breath the whole time!

So why is it i can go slower and still burn the same calories… in the same time?

I havent been watching my food but if i had to guess it would be about 2,500 cal a day…..
I also wear a heart rate monitor and it shows what the machine shows