I've just moved from FitBit (last 7 years) to a Venu 2. It appears to totally under record calories and I don't think that I've been receiving over estimates on any other tech as otherwise I'd have put on loads of weight. Appreciate that I'm an older woman but I'm also very fit indeed and do a lot of hard exercise yet I only got to 2,700 calories yesterday when I'm probably consuming 3,500 calories a day and not getting heavier. How does the Garmin determine base calories and exercise calories? Can it be tweaked to provide something which isn't under-recording what I do?