OnFitness Magazine Articles
Smart Fitness. Stronger Living.
Explore evidence-based articles on training, nutrition, recovery, health, and longevity — written for adults who want to build strength, move well, and stay active for life.
Inside Astronaut Training: What Christina Koch Reveals About Human Performance
Astronaut Christina Koch reveals how spacewalking challenges the body and mind — from marathon-level exertion in a pressurized suit to the strength, endurance, recovery, and focus required to perform in microgravity.
Inside the Mind and Body of Astronaut Christina Koch: Fitness, Fear, and Spacewalking
As astronaut Christina Koch prepares for the Artemis II mission, she shares a rare look at the physical demands, mental discipline, and resilience required to perform in the extreme conditions of space.