Mindfulness is a concept from ancient Buddhist philosophy that has been adopted by modern Western psychology.  Mindfulness has nothing to do with becoming a “Buddhist”, however; it refers to a way of living your life that is available to anyone, regardless of religious belief or affiliation.  Christians can certainly practice mindfulness if they want to.  In fact, the philosophy of mindfulness is identical to the philosophy offered by Jesus in the Sermon on the Mount.  Here is Luke 12:27:  Consider the lilies how they grow: they toil not, they spin not; and yet I say unto you that Solomon in all his glory was not arrayed like one of these