From MLB Power Pros Wiki

Overview

The blue ability, Tough Out, gives mastery of the swing to the batter through better control over his batting skill. Minor movements of the controller can ruin a hit, and this skill can provide some sort of leniency to very close hits, turning a quick grounder into an unreachable line drive.

Acquisition in My Life Mode (2008)

Gain Tough Out experience by:

• Getting a hit with 2 strikes
• Playing the Adventure video game