Cardio!!!!!!!

Running is a great choice for a variety of reasons:

• It doesn't require special equipment (except some quality shoes)
• You can can do it just about anytime, anywhere
• It's high impact, which helps build strong bones and connective tissue
• It gets your heart rate up more quickly than low or no impact exercise
• It helps you burn serious calories, especially if you add hills, sprints or try interval training.

In fact, a 145-lb person can burn 300 calories by running at 5.2 mph for 30 minutes. The same person would burn about half of that with a brisk walk. The downside is that it takes time to build the strength and stamina to run continuously and, because it's high impact, it may not work for every person.