It is a pity that Fr John Riley and the others are making such pronouncements without an adequate knowledge base. Yoga is a science, not a religion. While many great teaches have also a personal faith practice of Hinduism, there is a distinction. T. Krishnamacharya kept his guru's sandals to reverence, but not his yoga teacher's. My yoga teacher, Gary Kraftsow, who studied with Rev. Raimon Panikkar (one of the theologians who worked on Nostra Aetate of Vatican II) quoted him as observing that Catholic liturgy is kriya yoga.  The chancellor would do well to connect with those who have much experience in Christian-Hindu dialog and who also have a significant understanding of what yoga is and is not--for example, DIMMID(dot org) Monastic Interreligious Dialog.  If Fr Riley can understand that statement of Rev. Panikkar, and grasp the accuracy of it, he would likely reconsider his decision.