Nasa astronaut Jessica Meir showcased the European Enhanced Exploration Exercise Device (E4D) on the International Space Station, demonstrating its versatility for future Moon and Mars missions. This compact equipment aims to address the physiological challenges of long-duration spaceflight in limited quarters, unlike current ISS facilities. Experts suggest high-intensity interval training and plyometrics could optimize astronaut fitness in smaller spacecraft, reducing the time dedicated to exercise while maintaining muscle and bone density.