I have a distrust of Yoga, I always have because of how it originated. The question is asked--is yoga a religion? Many Americans will say no, but--Patanjali's Yoga Sutra, an ancient Hindu text is widely referred to in yoga classes today. It presents a moral code for yogis to follow and outlines the path toward a mystical state of enlightenment known as samadhi, or union with the divine. The traditions of yoga also recognize that the path of bhakti yoga, an important branch of yoga whose adherents devote themselves to a personal form of their concept of god--probably Braman. Its practices include chanting to deities, setting up altars to them, and even praying to them. Yoga's origins are said to predate modern Hinduism. Yoga as it has been imported to America comes more from the Dharmic tradition. Dharmic traditions emphasize universal ethics like nonviolence, the theory of karma and rebirth, and a culture of meditation. Sound familiar? Dharmic traditions are also pluralistic by their very nature.
There are some practitioners in the US that have secularized it, so to speak, changing the language. and tossing out the Patanjali's Yoga Sutra. It all goes down to intent. That being said. I would not touch Yoga with a ten foot pole.
Is this something that a Christian should be participating in? It is something you have consider prayerfully before you decide. Will it build you up as a Christian or will it ruin your example?