I wish I could say I've kept up the walking that I was doing during my post-op knee surgery rehab. As you say, exercise to that degree definitely requires time. After I was released from physical therapy, I kept up my walking for awhile, but then normal life returned, I stopped thinking about my knee (because it's healed and feels great!) and I stopped dedicating so much time to walking or other exercise.
That said, I now need to make time for walking and hiking and bike riding again because the penduluum's swung too far in the opposite direction.
My weight's maintained, but my cardio health and muscle strength (especially in my left leg's hamstring, which was harvested from to create my new ACL knee ligament) are lacking again.
Exercise is very important to a healthy, long life. I don't know why it's so hard to make time for it, but we all should!
And camping? Man, I can't even remember the last time I went camping. I *really* need to get back into doing that. Like hiking, it's terrific for one's mental health (imho) as well as physical health. It's the only "reality TV" any of us really needs -- birds, wildlife, the sound of the wind in the trees or water flowing in a stream/river. {sighs} Am I the only one who's fallen so far out of her routine when it comes to outdoor recreation? I miss it...