Something that people who aren't type 1 diabetics are likely not all that aware of is how much work and thinking there is for a type 1 diabetic who wants to do aerobic endurance activities. Although I think now there are some closed-loop insulin pump and CGM systems that are capable of handling things...
but I've never used an insulin pump and so I have to do a lot of thinking and plotting about when to eat, when to do things, all because