I posted the other day as I'd had a sickness bug and during the night felt unwell, so checked my heart rate on my watch. It was up to 120 and didn't go below 100 all night. The next day I was better and it went back to normal. But today its around 70-80 while sitting down but when I am moving around it is shooting up to max 120 again. I don't feel particularly unwell? In the past it's not gone over 100 while just moving around, even when walking fast pushing the buggy! Do I need to get checked? I can't find a proper answer on Google.