John Mozeliak aggressively pursues players and negotiates with agents.

Yadier Molina aggressively throws behind runners at first and catches would-be base stealers at second.

Albert Pujols aggressively swings at 0-2 pitches that stray across the plate and stretches singles into doubles.

Tony LaRussa aggressively (and brilliantly) tweaks his lineup on a daily (if not hourly) basis in order to give his team the best possible chance at winning, and sends runners from third when the pitcher blinks a fraction of a second too long.