Indeed, walking punches way over expectations for keeping weight off. You have to do a good hour of a walk, but an hour walking is probably better than a rushed workout of similar time.
Don't get yourself into a state where you need to lose 40kg. If you do, and lose the weight, you will have excess skin.
I like my new healthy self but actions have consequences.
I turn 50 this year and have committed to doing 50,000 pushups before 2024. It sounds like a lot, but after the first month, doing 200-300 a day isn't really that difficult (when broken up into smaller sets). Honestly, it's a LOT more of a mental challenge than a physical challenge.
It's all about showing up every day.
How so?
It could be as simple as you are less likely to indulge in a treat after a walk?