Get Bob's "back to business" fitness plan.
One thing to keep in mind when you are doing a cardio workout is that it has to be hard enough that you actually get a benefit from it. How will you know when you're there? "You can talk, you can carry on a conversation, you can sing," Oprah says. "But you really don't want to. It'll be uncomfortable after a few minutes."
While cardio is still a major part of her workout, Oprah has altered her workout balance to include more resistance training and weight lifting. "The older you get, the more muscle mass you lose," she says. "Resistance training has proved to be really fascinating because, even though the weight isn't dropping the way I would like it to, I can see actually that my shape is changing—it's getting firmer and the clothes are getting looser. And that's all because of the weights."