Many people who grew up playing sports were taught stretching and exercise routines that are harmful to the body and philosophies that may actually create barriers for success. Yoga is a holistic physical practice, meaning that the practice restores and optimizes the entire human system (including the bones, ligaments, joints, muscles, mind)in a complimentary fashion.
Often, athletes are coached to value winning, competition and physical pain which can result in long term injury or overuse. In fact, yoga can rehabilitate many of the effects of an old injury through its dynamic movements and focus on undoing physical and mental blockages.
Also, there is no “yoga body” - the physical practice enhances the individual frame and composition, so there’s no prototype to strive for on the physical level. Yoga teaches from a place of non-injury, and values self-study as a way to prevent damage and pain, so that each person who practices yoga develops their own individual pace for advancement.
There is nothing to win in yoga, even though the benefits of the practice feel like a reward.