One thing that fit people (e.g. a trainer or coach) usually forget is that the 1-4 hours they spend every day on training, prepping their bags, showering after the training, having a chat with the other training participants, is that the unfit people don't spend this time sitting around doing nothing.

Therefore, a major step in getting a healthier lifestyle is to carve out the time for dedicated sports activities, e.g. not joining the world of warcraft boss run with Leroy Jenkins, not reading that book on your desk, and/or not playing chess with your grandpa, as you used to in that time slot.

In one of my first attempts to improve my lifestyle that was a major hurdle. But walking is easy. It doesn't need much prep, it doesn't take a strain on your resilience as "harder" exercises would, and even people who don't believe in your health goals will believe that you are capable of taking a walk once in a while. So the burden of carving out that time is much lower when starting with walking. 10k steps for a beginner also means 2hs of walking every day. When you get faster, you can replace parts of it with other training. And then the next time when your overreading goals fail, you can fall back to walking instead of couch potatoing.

"Remember: Slow is smooth, smooth is fast." - Shooter, 2007