I do both--20 mile commute, minimum, on the bike or on foot with a backpack.

To be honest, I haven't run to work for quite awhile--usually only while ramping up mileage for marathon training.

Fixed that for ya.

The only problem that I've found is in getting proper fit on bikes and keeping wheels true for more than 2 or 3 weeks.

You know, I've actually seen a Brick Poo-House. There's one behind an old Italianate "mansion" in Galena IL.... and unfortunately my torso rather did resemble it.

My problem is that I'm short... and so are my legs. I'm STILL riding the same bike I got when I was 14. I just don't fit anything bigger.

As for keeping wheels true... I got my own truing stand so I don't have to wait for the mechs.

Lucky. I'm 5"4" and it's extremely difficult for me to go lower than 150...