Seconding walking. I had gained 40lbs and eased back into fitness slowly over 2 years. My issue with hiking is the prep time and driving and felt like extra steps. Stepping out the door with a good podcast on was the most accessible for me (recognize that I’m lucky to live in a place with sidewalks and some paths). If the nature part of hiking makes it more interesting to you though and more likely to follow through, go for that!