Muscle Up

Muscle Up is a gem effect in Xenoblade Chronicles and Future Connected. It raises the user's physical defence.

Overview
There are two ways to go about defensive gems: give them to softer characters so they can take a few more hits, or give them to tanks so they can take a lot more hits. Which one to go for is largely a matter of taste.

Triva

 * It is unclear why the gem is not called "Physical Defence Up" (or "Phys Def Up", as with Phys Def Down), as would be expected given the naming convention of other stat-raising gems.