I read The Continuum Concept when Luke was about three months old. I also joined the email forum. I remember one of the two talking about how a stroller isn't necessary.
When Luke was small, we hardly ever used our Bob Stroller (that I purchased at a lesser price on craigslist). I thought I would need it for all the jogging I would do, or shopping with Luke. I just thought you needed a stroller. My husband and I used it a few times when we went for a walk or when we would jog, which wasn't very much at all. We still took it some places and it was big and bulky and hardly fit in the trunk of our honda civic.
From the time Luke was about 3months on, I carried him in my Ergo and just went for walks. And we sometimes put him in the stroller when we wanted to jog together (again, rarely). The Ergo was great because I would walk a mile down to the local store and back, 2 miles total. Sometimes I would climb the back way over the hills by our house with my little guy strapped into my Ergo. I felt secure with him right there close. I actually felt weird with him being in the stroller so far away from me. Plus, if he wanted to nurse or get out, I was stuck holding him and pushing that stroller, which is why I mostly only did it when my husband was with me. We walked everywhere. In fact, the stroller sat in our garage for most of his life. Until he got old enough to ask to just get in it for novelty because he liked being pushed.
Just lately, I've taken him on a couple walks in the stroller because I also walk the dog on the leash and it's hard to do both. But last week the stroller wheels were flat and our pump was broken so I just decided to take him outside and let him walk while I held on to the dog leash and then again today with my husband. When we went by ourselves he walked the whole way around our little loop until he tripped then I carried him the rest of the way home. Today we walked to this elementary school park where he could play and the dog could sniff around. He walked the whole, almost 1/2 a mile there. Then he walked almost all the way back, until he fell and wanted to be lifted and taken home. No stroller needed.
It is a little hard on my back for him to carry him along ways without anything since I'm pregnant. But, when it's just me, I don't go that far from home anyway. We went to the park today because my husband was there to carry him home when he fell.
The theory in the book was correct. And now I believe it, that babies just need to be carried until they learn to walk and explore, then they are able to walk for themselves. Sometimes a stroller is nice to have, but it's better to have your child walk. I think this could possibly be a reason for kids getting the American lazy syndrome... because they aren't used to walking. They are used to being in strollers until they are way older. Then they aren't used to walking very far.
Anyway, this is just my theory for now. We'll see how Luke evolves into a walker. I really enjoy seeing Luke walk around and explore around the neighborhood. Maybe when our new baby comes, he'll want to take walks with me while I carry the baby. And maybe when he's older, he'll want to keep walking with Mama as we enjoy time together. :)