Authors:

There's always the day where you do the effort noises, so there's a lot of grunts, huffing and puffing, pretending like you're hopping over things, pretending like you're getting hit, and pretending like you're kicking. If any of that was recorded, it's some of the silliest stuff I'll ever do, as an actor, but it's fun and liberating, in a way, 'cause no one can see me. I videotape myself doing it sometimes, to send to my friends just to remind us how ridiculous our jobs are.

Source: collider.com
There's always the day where you do the effort noises, so there's a lot of grunts, huffing and puffing, pretending like you're hopping over things, pretending like you're getting hit, and pretending like you're kicking.