Cullen frequently shares pictures of the two in the paddock on her social media, and has already had a positive impact on Armstrong’s career.
He achieved a career-best finish of fifth at IndyCar’s 2024 Thermal Club event, around the time Cullen came on board as his physio.
The former F2 driver confirmed Cullen’s impact speaking to the Associated Press, and labelled Cullen as a ‘guiding force’, also revealing she is ‘more than’ a trainer.
“We’ve been working together not that long,” Armstrong said.
“I don’t even know how I managed races without her because she helps me to first off eliminate the distraction, because there’s so many distractions in this sport.
“And our whole goal is performance driven. If it’s not delivering performance, then we’re not going to do it.
“So she’s very much a guiding force when it comes to what we do on a daily basis,” Armstrong added.
“She’s not exactly a physio, let’s say. She’s more than that. And if it’s not delivering lap time, we’re not going to do it, plain and simple.”