Exercise!

[Crop]

Sat in my underwear eatin crisps & drinking beer & watching Match of the Day.

That's what I do all the time anyway.
I very very very rarely exercise. I'm naturally skinny no matter how much I eat (a lot). The only time I'd ever exercise would be to lose weight.

Although lately I have been actually feeling unfit, which has never happened to me before...I should probably go to the gym or something.