Anil Menon on the Physics of Fitness Aboard the ISS

Maintaining physical integrity in orbit is not merely a hobby but a survival mandate. Menon noted that without a rigorous exercise regimen, the human body suffers rapid decline: a monthly loss of 3% bone mass, a 10–15% reduction in muscle mass and overall body weight, and a significant drop of over 10% in VO2 max capacity. These metrics highlight the constant battle against atrophy in a weightless environment.

To navigate these physical demands, Menon credits the influence of Navy Captain Jack Hathaway. He describes Hathaway as a coach who pushed him to reach new levels of endurance, comparing the intensity of their training to the ethos of David Goggins. By sharing his routine and the underlying science, Menon frames exercise as a vital component of mission success, requiring the same level of focus and grit as any technical operation aboard the station.