Because it's the weekend, that's what I say.
The only other exercise I've had today was running around for about an hour with the dog at Flyball, but even though that gave me a sweat and got me out of breath I don't feel it was really enough.
Mr. has mentioned he'd like to go running with Fred. (he can just run, without any training - because he cycles to work every day) - so I'm thinking of doing the Couch to 5k programme to get some semblance of running ability. Got the app; now all I need is the willingness to get off my arse tomorrow!
Weather better be good...