If I had a spare camera to lend you, I'd lend it.
Fitness wearables? Like fitbits?
My take is that I count calories, and those calories are counted against an "active" lifestyle. If I subtract a fitbit from those calories it's giving me fake achievements. However, if I choose a "sedentary" lifestyle and subtract a fitbit from them, it should give me the exact same measurement as I had without the fitbit.
Except I had to buy (and wear) a fitbit.