

Walking, and add a weighted vest or backpack. Start light, like 5lb/2.5kg for a week or two, then increase by that much a week until you get to 40% of your body weight in a few months.
I find that 30lb/15kg is a great place to stop though, much more feels pretty rough.
Then just walk around. You can listen to music, podcasts, nature, bird sounds.
Do that 45 a day and you’ll be significantly healthier in a few months.







I can second these and add