Dr. Mehmet Oz says:
You don't need balls, mats and elastic bands to get a great workout. Dr. Mehmet Oz says there are only four exercises that you'll ever need to know - and none require fancy machinery!

• 1) Walk for at least 30 minutes each and every day. "Walking is the foundation for all other exercises because it increases your stamina and prepares your body for strength training," he says. You should strive to walk 10,000 steps a day.
• 2) Build muscle by lifting weights for 30 minutes a week. You can lift a dumbbell, a gallon of milk or your toddler - just start lifting!
• 3) Dr. Oz says you have to work up a sweat for about an hour a week. "The number one predictor of how long you're going to live is how well you can exercise your heart," he says. "If you can push yourself to sweat for an hour a week, that's great. You can break it down into three little segments of 20 minutes each."
• 4) Stretch so that you don't get hurt. Dr. Oz likes to do yoga, but he says you can get the same benefits from stretches you learned in high school gym class.

Fidgeting!!
There's one secret fat-burner that you can do anywhere ... fidgeting! Most of the one million calories you consume every year are burned without you ever thinking about it. Only 15 to 30 percent of calories are burned through intentional physical activity, so minor additions like being fidgety helps keep off the pounds!

http://www.doctoroz.com

I'm not a fidget-er so I guess I'm going to have to rely on the working up a sweat and lifting weights to keep my heart going.

An hour a week isn't bad at all! I work up a sweat for about an hour 5 times a week. So I guess I'm doing 5 hours a week. I hope I can keep this up for many years to come so I can keep my heart in great shape.

I got that information off his website.... do you think it was a typo mistake on his site??

That is 4 - 15 minute cardio sessions a week... that is a great place to start. It is hard to begin, but easy to maintain.