Walking/running is definitely on my agenda -- at work and at home (well, in the gym anyway).

My most recent "achievement" was treadmill running and fast-walking about 12km last Tuesday evening... which consumed 1000 calories according to the machine's calculator.

I took several days to recover... including a day of putting up with missed (or actually empty) heartbeats, but the benefit was feeling quite a bit stronger on the Bike Friday for this weekend's two rides.

I started the treadmill running about two years ago ostensibly as training for triathlons. A tri hasn't happened yet, but unlike a lot of people who find running and/or walkung to be stupid, and even more so on a treadmill, I quite enjoy it and especially when there are metrics I can use... and tangible results on the bikes.