Walking is free, start slowly, invest in a good pair of running shoes. Each day see if you can add a minute or 2. Before you know it, you will be looking fwd to your walks. I started on a treadmill because we live in cold climate. Then I walked the track at our local community centre. I have lost 37 of my 60 lb goal, I'm 68 years old and have had a spinal fusion. I'm now walking 10-15k steps everyday. Some days I drive to a park, other days (in inclement weather) I mall walk. Lots of choices. The other best option is aqua fitness or swimming in general. Find your way of moving and switch it up. Your only limitation is the ones you put on yourself. I have found since loosing the weight my knees are much happier