Hi Francisco,
Based on what I understood you need to pass TreinoId (if required also pass the Start Date) to the Second screen (i.e., Trein_marcar_faltas_proatividade) as input parameter and define a Filter clause in the Second Screen Aggregate (i.e., GetDadosTreinoes) referring the TreinoId input parameter value as shown below.

In the first screen (i.e., Trein_Treinos_Marcados) map the aggregate resultset Treino.id attr value to the TreinoId on the Link Onclick event as shown below.

Similiarly you can also pass the selected row date value on the Link OnClick event (from the first screen) as an input parameter to the second screen and also define additional filter clause in the second screen Aggregate refering the Input date parameter value.
I hope this helps you!
Kind regards,
Benjith Sam