Walking is the best way to begin that lifestyle change. Walking is easy, it's pretty relaxing, and it helps establish that there's a period of time in a person's day dedicated to getting them healthy. Plus, that 45 minutes of walking can be split up over the day. And with some commitment, most people can become pretty fast walkers.
You are absolutely right that adding an hour a day of exercise is a major lifestyle change, but so are a lot of things in life.
The lifestyle change is also the point isn't it. Anything else is either "product" research or selfdeception.
I mean if youre willing to walk around with an oxygen mask allday and aren't bothered about possible health consequences, there is also plastic surgery.
You are absolutely right that adding an hour a day of exercise is a major lifestyle change, but so are a lot of things in life.