Quote:
Originally Posted by Aoife
It is more elaborate than "just" a formula. It has a 3axis accelerometer, it measures your heartrate and body temp, and other things. So… it's taking in a lot of variables to make its formula it uses… based on those factors (way more than just your height, weight, age, and sex), and spits out something that's been pretty close to accurate for most of the people on the board who have it.
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Just a minor correction--the GWF can't measure HR. All the other listed measures are correct; what's missing is that it senses how much you're sweating and uses that as a variable to determine how much you're burning.
I've had mine for around a month now, and like many others, I think it's the best purchase I've made for my fitness goals. My case is a little different from the others in that what I (initially, at least) found it most valuable for was to see that I don't have a "broken" metabolism. I'd been undereating for some time, and while previously I had upped my calories, I hadn't gone far enough. GWF helped me get to my true maintenance, which seems to be around 2500 (about how much I ate before I started to gain; I was deliberately trying to eat above maintenance to make sure my metabolism was stoked for fat loss).
In terms of fat loss, I've only been using it for that goal for five days now, so I think it's too early to say with reliablilty that it has my burn spot on.
Like Aoife said, it's not strictly necessary, but several people find it useful. I'm one of them and do not regret my purchase.
