Will Rosemary Coogan be the first Briton to walk on the Moon?

Rosemary also has a whole range of exercises to do to prepare her physically. Today, she’s straining her leg muscles in a pair of yellow and brown shorts that simulate the restrictions of wearing a space suit.

Later, she practices floating weightlessly underwater. Her blue astronaut suit is full of air, and she’s attached to weights at her feet and a pole in front of her. She practices moving her legs and arms in slow motion while simulating the extreme conditions she’ll face outside the ISS.

“There is something truly magical about feeling weightless,” she reflects. “It’s a very, very special thing.”

Rosemary’s day isn’t just one of hard work. She also finds time to practice cosmic ballet – a series of movements that help astronauts navigate their way around the space station in zero gravity.

As the training pools close and the light fades outside, Rosemary finishes her six-hour dive and reflects on the day.

“You know it’s hard work, and it’s challenging, and it can be tough,” she sighs. “But it’s the best job in the world.”