4km is about where I start getting cramp too, though I made a point of consuming some sweet and salty snacks on Friday evening last week and didn't have any issues with my 5km on Saturday, will try the same again this weekend in preparation
I aim to do three sessions a week - monday, wednesday and friday mornings before work but tend to skip one out here and there because of my stupid 6am brain reasoning with me that sleep is more important than anything ever.
Anyway, I'm four weeks since skipping a session now so feeling pretty good. Tend to swim 3.2km (2 miles) in a session but have thrown in a few 4kms here and there. Hopefully I can keep it up and get a little fitter.
Have you got over your cold yet Dano? (It might not be much fun for anyone following you either )
Who gets over a cold in 2 days? Not me I can tell you, they usually last around 7 - 10 for me, it's going to be a rubbish swim on Saturday, got informed there could be up to 8 people in my lane yesterday too, one of which is significantly slower than me so yay for getting held up I guess, sorry, I'm on a bit of a downer about the whole thing now, blimmin cold lol