That's exactly what I started doing last year when covid hit. Before then, I used to do decent running / stepper cardio in the gym. When covid hit, I cancelled my bus pass membership and have been walking everywhere since then. I do all my groceries, buying pet food etc walking. It takes about 40 minutes and I get to listen to podcasts during then. I have even started to "plan" my groceries - so I only buy around 2-3 days worth of meat and that ends up forcing me to leave the house at least every couple days. I sometimes plan things like buying larger items like toilet paper on separate days so I can walk with all my items without having to do uber or something else.