Tai Chi doesn't look like it could make you break a sweat, but there may be big benefits from the slow, gentle movements of this ancient Chinese martial art.

Researchers tested out Tai Chi's effects on two groups of seniors. One group took Tai Chi classes three times a week for 16 weeks,

While the other took health education classes.

At the end of the study, the Tai Chi group not only moved better, had more energy, and felt less pain, they also had an immune system boost.

When participants got a shot of the vaccine for shingles--a disease caused by the same virus that causes chickenpox--the Tai Chi group had twice the immune response.

That's potentially important, since our immune systems tend to weaken as we age.

Of course, you should let your doctor know any time you start a new exercise program. And it's a good idea to have a qualified instructor show you how to practice Tai Chi properly and safely.

But anyone regardless of age or physical ability can do Tai Chi and benefit from it.

Even a coordination-challenged doctor.