What kind of is safe for obese people

I would also start with walking. If you don’t have any issues with your knees or hips, then walking for a few minutes every day would be the safest way to start. You can go for 10, 20 or 30 minutes at a time and when you feel comfortable with that duration then keep increasing it every other week or so (depending on how you feel). Hiring a trainer even for a few sessions would be a very good idea as well.