If you think running marathon is hard, how about running one in space? It is strange and complicated, but European Space Agency (ESA) astronaut Tim Peake is going to participate in the London Marathon while being in orbit.

British astronaut Peake will soon visit the International Space Station (ISS). The astronaut announced on Friday that he has planned not to miss the London Marathon and become a remote participant.

The 43-year-old astronaut will head to the space station in low earth orbit on December 15. He will be launched for a six-month mission on a Russian Soyuz spacecraft. The launch has been scheduled to take place from Kazakhstan.

Peake said he will run the 26.2-mile marathon on April 24 from space station. While thousands of people will race on earth, the astronaut has planned to run on a treadmill. The Virgin Money London has posted a video where Peake can be seen talking about the London Marathon. It’s a worldwide running event and it’s the time to take it out of the world, Peake said in the video.

“I am running in space to raise awareness of The Prince’s Trust, which has a team running on the ground—Team Astronaut—while I’m running on the ISS”, Peake said. He previously participated in the London Marathon in 1999.

The astronaut will run the full marathon with the help of a digital virtual-reality experience. Peake will be able to see other participants’ avatars running the race. As he will run in space, a harness will keep him in position.