So I'll admit, I feel privileged every day when I ride my bike. I have legs that work. I have two arms for balance. Not everybody can say that: I'm fortunate.
But the whole "hard work and exercise isn't for everyone" undercurrent to this thread is in my opinion, bologna. I'm sure that if CPA Cat didn't own a car, she would have found a way to make the bike commute work.
And in my opinion, driving to work/school is a privilege. It's something to consider doing only after you get close to FI and have extra cash to burn. The person who can afford to drive to campus (or even own a car in grad school) sounds pretty fortunate to me.
It's a time thing too. I know this is MMM and all, but time is an issue for many. Some people live far from work and cannot move closer. As in, two people with two jobs in two different places. Or they are underwater on their house, or they can't afford a house in the new place or...
So 10 miles to work. I like it. And my spouse and I did it 1-2x a week, where I rode TO work and he rode HOME from work (used a bike rack for the other bike).
That worked fine when I worked 32 hours a week. But now I work 40. It's a time thing. In order for me to bike to work on the days that we can do it, I have to leave by 6:40 am, because it takes me nearly an hour. That gets me to work in time to work 8 hours and then leave on time to pick up 2 kids at 2 locations before they have to be gone.
I can BARELY work 40 hours in a week. Any school function, doctor's appointment, etc., required me to take PTO. I don't have enough PTO for the sick days, school holidays, federal holidays, etc. At 32 hours a week, I had wiggle room and now I don't have wiggle room.
So 6:40 am just doesn't happen because those are my husband's gym days and he doesn't get home until 7. Plus we had to screw everything up and change schedules a couple of days a week. Theoretically, on the swap days, he could bike in the morning and I could bike home - but that gets me home at 7 pm. That's kind of late for me. I've got friends who can work shorter days and then just do a little extra from home at night, but I literally get home and cook dinner, feed the kids, pack lunches, start prepping for the next night's dinner, get the kids to bed, and pass out (in reality I am asleep before they are on most nights).
There is going to be a point when the kids are in the same school (for a single lonely year), which may make it more feasible. I'm still trying to figure out how to work it out. Maybe Fridays?