This is a regular verb. It follows the conjugation pattern of the verb falar.
Present:
A Ana varia a rotina dela para se manter motivada.
A Ana varia a sua rotina para se manter motivada.
Ana varies her routine to stay motivated.
Imperfect:
A agenda do Miguel variava bastante.
Miguel's schedule used to vary a lot.
Conditional:
A Clara variaria o plano se fosse necessário.
Clara would vary the plan if needed.