Walk. I walk a lot... well not since the last few days since I broke a bone, but usually :p
Public transportation. here in Paris we have a lot: buses, tram, metro, train.
Taxi or Uber when we really have to. My spouse and I have not owned a car in over 20 years.
We have also refused to travel by plane since the early 00s. Be it for personal or pro needs.
Walk has had the most crucial influence: it helped me get back into shape like nothing else did, both physically and mentally. A few years ago, I was not walking at all. As a matter of fact, I could barely walk a few meters before having to rest, my health was a mess. Nowadays; I will walk every single day for 8km or more.