For:
I am fat and unfit.
Swimming will help me be thin and fit.
It might help stave off the sagging.
Against:
I'm very fat and hideous and there will be people there.
I'd need some serious hair revoval first.
The pool is full of other peoples wee and germs.
It's very cold.
It bores me senseless.
Also any alternative to baring my bod? And does it matter if my back is knackered?