One of the astronauts stranded on the International Space Station since last June explained in a new interview that she is struggling to remember what it feels like to walk and lay down. Suni Williams made the concerning comments while on a call with students at Needham High School located in Massachusetts on Monday — as she and fellow astronaut Butch Wilmore continued their seemingly never-ending orbit around the Earth.

NASA astronauts Suni Williams and Butch Wilmore completed a spacewalk Thursday while awaiting their delayed return to Earth. Williams set a new spacewalking record for female astronauts during the mission.