Robert Irwin didn't let an injury slow him down on Dancing With the Stars .

Before taking his final spin on the dance floor with pro partner Witney Carson , the 21-year-old shared how he had injured his rib while practicing his quickstep routine to Jet 's "Are You Gonna Be My Girl?" ahead of the ABC dance competition's season 34 finale.

"I've been dealing with rib pain because the intercostal muscles of the ribs are under a lot of tension." he said in a video package during the Nov. 25 episode, explaining how the dance required a lot of control of that part of his body."It's been getting worse progressively."

Still, the pair delivered a stunning performance, with the judge Derek Hough —who chose the dance for the duo—calling Robert the "quickstep king."

"It was crisp a

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