Yes, sell it as relaxation exercise or breathing practice. But don’t make people believe this has anything to do with Buddhism. We already watered down and distorted what people think yoga is. Let’s not do this to Buddhism.
I practice mindfulness, but I would never consider myself a buddhist - it took a "secularised" text to get me to pick it up (Mindfulness in Plain English; it's written by a buddhist monk, but makes clear from the beginning that it's a practical guide rather than a guide to the Buddhist spiritual background for mindfulness).