The room is quiet. Soft light streams through the shaded windows. A soothing voice breaks the silence and addresses the cancer patients and caregivers sitting on yoga mats.

"Focus on your breath. Inhale deeply and exhale," Smitha Mallaiah says. "Bring in positivity and let go of your tension."

Mallaiah, a mind-body intervention specialist at MD Anderson, leads our Yoga for Health class. This is one...