Level 0

This is where people who have not ever worked out and who are obese should start. The reason why you start here because it is important that you start out slow to prevent injury. Start out walking and the absolute best thing you can do is swim. Swimming works every part of your body in a way that even weight training can not do. I personally have not been more sore after swimming than anything else. You can mix in the weight training routine from level one also but keep it simple.