T'ai Chi: An ancient martial art focusing on smooth, slow movements that cultivate inward focus and free energy flow. T'ai Chi is properly pronounced tie-jee.

target heart-rate zone: A range that is between 50 percent and 85 percent of your maximum heart rate that can tell you what heart rate to aim for during a workout.

treadmill: A popular choice for a cardiovascular machine in a home gym if you enjoy fitness walking and jogging (or running).