Bro, no offense. But if that is you in your avatar pic, there is no way you are a pure mesomorph. You look like a endomorph with some meso traits. People don't realize how rare pure mesos are. They represent .01% of the population
HAHAHA! Your delusional bro! There is no possible way you are burning calories at that rate! Trust me on this. You don't have that kind of cardiovascular conditioning to accomplish that. That type of caloric expenditure is only found among ELITE endurance athletes!
No offense buddy, but there is no way you are truely burning 900 calories in 25 minutes. Trust me, I am in way better cardiovascular shape than you and burning 800 calories on the stepmill in 30 min almost kills me. By the way, I am 210 lbs at around 7-8% bodyfat.