This is a regular verb. It follows the conjugation pattern of the verb falar.
Present:
A Ana treina todas as manhãs antes do trabalho.
Ana works out every morning before work.
Preterite:
O Miguel treinou para a competição no mês passado.
Miguel trained for the competition last month.
Conditional:
A Clara treinaria mais se tivesse tempo.
Clara would train more if she had time.