Brook has had some silly ideas in his time, but this is one we can all get around!
It's all taking place up the architectural phenomenon that is the Auckland Sky Tower on Sunday 6th August 2023, where Sin & Brook will tackle 51 flights of stairs (328m) all in the name of charity.
Brook's arranged for an Elliptical Cross-Trainer to live in the George FM Studios so he can train in between marginal dribble in the lead-up to this massive feat.
He's already been pumping his pins on that thing so expect a big performance from him when the big day rolls around.
If you'd like to support Sin & Brook in their efforts, any donation is welcome. You can donate here.
Every day, eight Kiwis find out they have blood cancer. It's obviously devastating news to hear.
Money raised from every single participant in the Step Up challenge goes towards the foundation to help make things easier for those affected by blood cancer.
Entries are unfortunately closed for this year, but if you're keen to give it a go, follow along with how Sin & Brook go to see if you've got what it takes!