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The Apple Watch does that too. It seems to do loads and I am still learning about it. But still, an expensive stick really 😁
Today, according to the watch, I have used 436 calories - 47 mins of squash. I’ll do weights later (maybe 70 mins) and probably walk for a hour to get to the target of 1100 calories. All achievable as I’m not working today. No so easy, or impossible, on days when I am working.
Food intake = calories in
Activity = calories out
The Law of Thermodynamics? I’m not sure if that is the correct law but you did mention it previously.
I’ve managed to keep my weight down for a week but my activity levels have raised to do it. Lots more walking seems to be the answer when I can’t play squash, do weights or footie.
The watch spurs me on so, if nothing else, it is an expensive stick!