Thx, very good! But it's a question of proselytizing. You might see plenty of persons doing the sun salutation in Central Park on a clear day, but it's not for gaining converts. Fundamentalists like the football coach believe they are commissioned by God to spread the gospel, and that includes making a "show" of it. Yoga practitioners generally feel no Divine imperative to spread a belief system.
At any rate, I'll abide by Matthew 6. - private. Others may feel the need for group prayers, holding hands, swaying of the body and singing praises of God. (perfectly legitimate behavior, and well accepted in many parts of the country). It all started in Texas with the Dallas Cowboys.