Does that runtastic app track heart rate?
They all use different equations for their calculations, in general. You would think someone would demand they be corrected if they're overestimating, but cardio machines as a rule overestimate, and no one's corrected them. People *like* burning more calories! Even if it's not true.
They're all estimates at the end of the day, and you have to take that into account. You won't super accurate unless you're in a lab with a mask and scientists with clipboards. ;)
Are those friends more overweight than you? You probably DO burn less than someone who walks less often. The more you do an exercise, the more efficient you are at it. Not a bad thing. :)
Writer, mother, wife, and breadwinner. I love to run, but running doesn't love me, so I'm switching to my low-impact bike.
I'm not pregnant, just fat: My blog. fatnotpregnant.blogspot.com/
| current weight: 186.4