“Consistency trumps intensity every time,” says Latham.

So how exactly does one work out in space?

There’s no seat on a bike just handrails and using a treadmill requires a harness.

Astronaut collage design with tape over eyes

Getty Images

Koch, an avid yogi, was also able to adapt her practice to space.

“I would get into a posture and just let the air current move me around.”

Astronauts are permitted to receive some shelf-stable goods from home.

Koch chose dark chocolate, but, of course, her supply was limited.

If you thought yourwashdaywas complicated, try shampooing in outer space.

As on Earth, some strands will probably be shed during this process.

But unlike on Earth, “they won’t drop to the ground,” says Metcalf-Lindenburger.

“So you’ve got to do something about it or your crewmates will be annoyed.

No one wants a floating hairball in space.”

The sticky side of a piece of duct tape acts like a catchers mitt for errant strands.

She says powder formulas are your best bet when floating in a spacecraft liquids can get messy.

The mental toll of a spaceflight can be as great as the physical one.

Former astronautPeggy Whitsonhas spent a total of 665 days in space, more than any other American.

“I was helping keep the space station alive,” says Whitson.

Koch found socializing in small doses at a time and brainstorming topics of conversation beforehand helped ease any anxiety.