Does anyone swim for fitness?

[Kellamity]

I hate running, I've tried the couch to 5k programme and just hate it with a passion however I do quite like swimming. Is there a couch to 5k equivalent swimming programme?

I swim for fitness. I've started at 30 lengths in 30 mins (25m pool, breastroke) three times a week and aiming to improve on number of lengths in same timeframe.