The bg behaved much as I expected (and definitely no injections needed, swimming drops me and so does insulin).
I usually inject 4-6 units before getting out of bed to counter the foot on the floor effect or liver dump, and I even take this insulin on a lower dose on swimming days.
Today I decided not to, and let foot on the floor cover the first half of my swim. I woke up at 10 am with my bg at around 5. FOTF gave me a short peak up into the 8ths or maybe low 9s shortly before starting my swim.
I had my first break at 40 minutes in, but only used my phone to check my sensor. It said 6.9 at that moment, which I didn't quite believe because of the time lag, I suspected to be in the low 5's already.
So I ate a piece of apple and went on, trusting the apple to keep me safe for another 30 minutes or so.
Next stop I did use a fingerprick, 5.9 so I thought I'd be fine until the end.
I was, but when I came out I'd dropped to 4.3, so I should have had something more to eat to create a bit of a safety buffer (no matter how happy I was with that 4.3), the last leg was longer than I thought.
And then in my festive spirit I messed it all up at home of course, spending time with neighbours in the garden and having a
beer barley smoothie for breakfast to celebrate without even bothering to check my bg.
All worth it though, even though it kept me in the 7's for a couple of hours even after injecting. Back to a nice and stable 5.2 by now so all is well.
Definitely!
On all aspects of your post.