Pilates (English pronunciation: /pɨˈlɑːtiːz/, German: [piˈlaːtəs]) is a physical fitness system developed in the early 20th century by Joseph Pilates in Germany, the UK and the USA. As of 2005, there were 11 million people practicing the discipline regularly and 14,000 instructors in the United States alone.

Pilates called his method Contrology (from control and Greek -λογία, -logia).

Pilates is a body conditioning routine that helps build flexibility and long, lean muscles, strength and endurance in the legs, abdominals, arms, hips, and back. It puts emphasis on spinal and pelvic alignment, breathing to relieve stress and allow adequate oxygen flow to muscles, developing a strong core or center (tones abdominals while strengthening the back), and improving coordination and balance. Pilates' flexible system allows for different exercises to be modified in range of difficulty from beginning to advanced. Intensity can be increased over time as the body conditions and adapts to the exercises. No muscle group is under or over trained. It enhances core strength and brings increased reach, flexibility, sure-footedness and agility.

Denise Austin (born February 13, 1957) is an American fitness instructor, author, columnist, and former member of the President's Council on Physical Fitness and Sports.

Austin was born Denise Katnich in San Pedro, California. She started gymnastics at the age of 12, which led to an athletic scholarship at the University of Arizona.

In 1983, Denise married sports attorney Jeff Austin, brother of US Open champion Tracy Austin. Denise and Jeff have two daughters, Kelly (b. 1990) and Katie (b. 1993). The Austin family resides in Alexandria, Virginia.

Austin initially attended the University of Arizona on a gymnastics scholarship, reaching the rank of No. 9 in the NCAA on balance beam. She later transferred to California State University, Long Beach, graduating with a bachelor's degree in physical education, and a minor in exercise physiology.

Since then, she has been teaching classes, producing fitness shows, creating exercise video tapes, and writing books and columns on exercise and staying fit. Examples include Shrink Your Female Fat Zones, Pilates for Every Body, and Eat Carbs, Lose Weight. In 2002, she was named as a member of the President's Council on Physical Fitness and Sports, and began her second term in 2006.