  We describe a simple derivation of virial relations (VR) for arbitrary
action-governed systems. These follow directly from the action with no need to
go via the equations of motion. When some of the degrees of freedom are of the
same type a tensor virial theorem presents itself. Further generalizations are
discussed.
  Symmetries of the action may lead to identities involving the VR.
  Beside pointing to a unified provenance of the VR, and affording general
systematics of them, our method is a simple prescription for deriving such
relations. It is particularly useful for treating high-derivative and non-local
theories. We demonstarte the procedure with several examples.
