Yoga and money sounds like an unlikely mix. But if you constantly make spending decisions that get in the way of a manageable, enjoyable life—anything from buying an expensive gift that you can’t afford to the “creep” of small purchases that become big debt—then you and your money are out of balance.

The ancient Sanskrit term yoga literally means “to unite” and to “to control.” The different yoga disciplines are all designed to create a union between the mind, body, and spi...