To be fair to Justin, he actually walked regularly and routinely long before I got bitten by the walking-as-exercise bug (forced upon me by my knee surgery and resulting ongoing rehabilitation). He'd walk with his parents if I "bugged out" and didn't join them. He'd walk right after getting home from work and letting the rush hour traffic die down a bit. So, I don't mean to make him sound like he's a laggard in the least. It's just that we've swapped roles in the past 6 months or so, and he's recently expressed wishing he had the kind of walks I do. My answer? He can!
You are right that my consistent walking and post-surgery physical therapy has me at a pace that Justin or others will likely need to work up to. I don't mind slowing down -- they slowed down for me after my surgery, when I hardly felt like I was moving forward at all!
The important thing is simply getting out there and doing it. I think a combination of mileage and exercise time goals will work for us best -- it's worked well for me independently. While I have luxuries that I didn't have when I worked in corporate America, I think the proposal Justin and I discussed last night is sound -- shoot for 2 hours of walking per week and 6 miles. If our pace means it starts out at 2 hours of walking and 4.5 miles or whatnot, that's fine too. The goal is consistently getting away from the computers, away from work or other stresses, and enjoying the outdoors and exercise together.
Eventually, we'll resume hiking and -- as had been my goal for 2005 before I got injured -- some short backpacking trips, though I know I'll be doing some solo (just as some of Justin's flights are solo because I'd rather be doing other things, sometimes.) Rehab wise, I am still a long way off from backpacking yet, though it'll be a topic of discussion when I see my orthopedic surgeon again this coming Monday. He didn't even want me hiking until 16 weeks post-op! I cheated a little, but not much... no sense ruining all the terrific work he did to rebuild my knee, and all the work I'm doing to rebuild the muscles.