Abstract Mission X: Train Like an Astronaut is an international educational challenge focusing on fitness and nutrition as we encourage students to “train like an astronaut.” Teams of students (aged 8–12) learn principles of healthy eating and exercise, compete for points by finishing training modules, and get excited about their future as “fit explorers.” The 18 core exercises (targeting strength, endurance, coordination, balance, spatial awareness, and more) involve the same types of skills that astronauts learn in their training and use in spaceflight. This first-of-its-kind cooperative outreach program has allowed 11 space agencies and various partner institutions to work together to address quality health/fitness education, challenge students to be more physically active, increase awareness of the importance of lifelong health and fitness, teach students how fitness plays a vital role in human performance for exploration, and to inspire and motivate students to pursue careers in science, technology, engineering and math (STEM) fields. The project was initiated in 2009 in response to a request by the International Space Life Sciences Working Group. USA, Netherlands, Italy, France, Germany, Austria, Colombia, Spain, Belgium, Czech Republic and United Kingdom hosted teams for the pilot in the spring of 2010, and Japan held a modified version of the challenge. Several more agencies provided input into the preparations. Competing in 137 teams, more than 4000 students from over 40 cities worldwide participated in the first round of Mission X.

Highlights ► An international educational fitness and nutrition challenge. ► Eighteen activities based on skills that astronauts learn for space missions. ► Cooperative outreach program that engaged 11 space agencies and nine institutions. ► Involved 12 countries, 137 teams, eight languages, 4164 students, one Mission. ► Has lead to a Multi-Year Campaign to grow global involvement over the next 3 years.