I get what all of you are saying, but the fact is, as soon as you throw a power meter in the mix the guessing game becomes pure measuring by physical laws, and therefore the readings should be much more accurate. Like I said in the previous post, my Kickr Bike connected to SUF produce pretty believable results.
Basing calories on HR alone is tricky, yes, but Garmin and their Firstbeat technology always got very close to the numbers produced by the power meter.
In this regard, after only one workout logged, I am a bit disappointed by whoop.
Even a rough online calculator (fed only with body measurements and time) reports calories better, in my opinion. I am open to change my mind after further testing…
In my first example whoop is off by 56%!
In the last year, I successfully lost weight by using calorie counting. Yes, whoop, is right that sometimes there can be up to 20% margin of error. I still managed to predict my weight lost very accurately through all the month by using simple math. Even with eating back the exercise calories. In my experience the margin of error is - most of the time - much smaller.