Yoga is one of those unassuming types of exercise that will kick your ass before you even realize it’s doing it. Even Ti chi will leave a couch potato gasping for air. If you’re that out of shape, the best thing to do is to walk an hour a day for a month, the begin to slowly increase your pace and distance. Try to go further in that hour than you did last week, but try to keep it consistent for the full week. After a while begin jogging, and then finally running. Try not to sprint, but get a good run in. Then start with they gym. If your heart can keep up, it’s easier to get your muscles in shape afterwards.