Mitch has a licence to run
Grivens, a rugby league convert who started playing the game only four years ago, is one of the Swans' most reliable players.
The 24-year-old enjoyed one of his best seasons last year and is again riding high in a rebounding role from defence.
"I'm loving footy at the moment," the local school teacher said.
"Loving footy and loving playing hard."
Grivens said he was starting to feel comfortable with his role in defence, with occasional forays to the wing, and puts that down to what Swans coach Ron Meldrum has given him.
"I've been given a licence to have as much free run as I possibly can," Grivens said.
"But what I'm really happy about is that we're getting it together as a team; working together for our game plan and using each others strengths.
I think we've all been re-energised this year.
"There's a few new faces around and we've been working off their energy.
"Spots in the team are up for grabs so it's pretty competitive there, too, and everyone is working hard at training."
Lismore beat Ballina in the first round in wet and windy conditions.
The game today, switched from Lismore to Ballina's Fripp Oval, should be played on a dry track.
The Bombers were run at hard by Nimbin last Saturday and need to be right on their game.
In the other game today, the confidence-high Nimbin Demons host premiers Byron Magpies at the Nimbin Showground.
Games start at 2pm.