The general public knows astronauts receive state-of-the-art physical training to go into space, but we never hear specifically of what astronauts experiences in the way of physical symptoms? What about things such as nausea, vision problems, disorientation, headaches, imbalance, and the like?

I do not know how physical conditioning plays into either ameliorating or even increasing those symptoms to adapting to space. Almost everyone has to do some adaptation. We have been created and evolved here on Earth, with gravitational forces and other parts of our environment that have actually helped to design us -- we may not have been just dropped here. This environment has helped to design us and now we are in a brand new environment. How physical conditioning effects are adaptation in space, I do not know

We do not have a formal physical training program. We are monitored periodically on how successful we are in physical fitness, but there is no formal program. Each astronaut maintains their own fitness in the ways they feel most comfortable with