Yoga is self-paced and under your full control, it is the regular participation and stretching that provides the many benefits.
Quote from Kareem Abdul-Jabbar (NBA basket ball player) "Basketball is an endurance sport, and you have to learn to control your breath, that's the essence of Yoga too. So I consciously began to us Yoga techniques in my practice and playing. Americans are very good at cardiovascular endurance and strength, but flexibility is the missing element. This is why a lot of athletes get injured. I think that doing Yoga really helped reduce the number and severity of the injuries I suffered during my career. As preventive medicine, it's unequaled. Yoga made my training complete. There is no way I could have played as long as I did without yoga."
Some celebrities that practice Yoga.
Jerry Seinfeld
Shirley MacLaine
Candice Bergen
Sarah Miles
Raquel Welch
Tatum O'Neal
Olivia Newton-John
Connie Stevens
Charlie Sheen
Jamie Lee Curtis
Jeff Bridges
Brett Eckland
Bianca Jagger
Emilio Estavez
Barbara Streisand
Sting
Madonna
Nick Cage
Gwenyeth Paltrow
Cameron Diaz