Overrun
Cooldown: 5 seconds
Charge forward to stomp and launch enemies. You are unstoppable while charging.
Cardiac Overdrive
Cooldown: 12 seconds
Nearby allies take reduced damage and heal by dealing damage.
Cage Fight (Ultimate)
Needs to be charged
Deploy a barrier that traps yourself and enemies. Automatically reloads Mauga's Chainguns at the start of the ultimate.
In case the video won't load here's the external link.
A Guide for the Hero Mauga from Overwatch
The narrator talks about the hero generally then summarizies it's abilities and how you can use the effectively in the most precise but shortest way. In the background there are clips from the game, possibly it's the narrator's gameplay. He talks about against which heroes can and can't be this specific hero be used.