Astronauts Chris Williams and Jessica Meir work on the European Enhanced Exploration Exercise Device

iss074e0490824 (April 15, 2026) --- NASA astronauts Chris Williams and Jessica Meir, both Expedition 74 flight engineers, remove and replace components on the European Enhanced Exploration Exercise Device (E4D) to ensure accurate motion, alignment, and long-term system performance. The E4D is being evaluated inside the International Space Station’s Columbus laboratory module for its ability to support crew workouts on missions to the Moon, Mars, and beyond. Credit: NASA/Jessica Meir