What is Four's srategy for selecting his team "Capture the Flag" paintball game?

Four and Eric are the team captains, and the first person Four picks is Tris. He tries to convince Eric he's picking the weaker members, but Tris realizes he's picking people with small, fast body types, because capture the flag is a game of speed. Eric is cocky that his team of brawn will win. Four and Tris climb a large hill. They continue to climb until the reach the top. Tris spots where the other team is hiding their flag.