Of course it is. Particularly for its benefits with regards to mindfulness and the relief of stress through meditation. The issue that exists is that yoga is used in other non-Christian religions to invoke or pray to the gods they believe in. This is explicitly not what we do as Catholic Christians. We can, however, use the yogic poses for our own purposes. Paulist Father Tom Ryan helps people do exactly that. Check out his website.
from Mike Hayes and the Busted Halo Question Box