It's the final this weekend and Joe and Katya are the favourites to win.
But the pair say they're taking no chances and going all out in training ahead of Saturday's show.
Speaking to Chris Evans this week on his Radio 2 breakfast show, Katya confessed: "We never have a rest.
"We're always on standby."
Joe then revealed: "There's a strap!"
He explained how Katya uses it to help keep his posture in check - laughing at the idea she could whip him into shape.
Katya then teased the pair's plans for the weekend: "The show dance - I'm not going to tell you too much… I hope it's going to be really magical."
This weekend the final couples will each dance three times: Their showdance, a favourite dance from the series, and a pick from the judges.
Joe and Katya's showdance will be to You Make My Dreams by Hall & Oates while the judges have chosen them a Viennese Waltz to Somewhere My Love from Dr Zhivago.
The couples' favourite choices will be revealed on the night.
This year there will be no eliminations in the final, with all four couples dancing until the end of the night where the winner will be announced.
Strictly Come Dancing 2017 airs Saturday night from 6:30PM on BBC One.