I only really started swimming at the end of April when i joined the local Triathlon club.
I was barely able to do a length of the 17m pool at that point - we do our proper training one a week in a 25m pool.
Managed 30 lengths this morning, with a good few breaks thrown in there but it's coming along nicely. Getting the breathing right so I'm, not gassed at the end of length is coming slowly enough but I'm getting there.
It's a wonderful way of preventing stiffness from setting in the morning after a run/cycle.