Chi Gung Cloud Hands and Space flight
Many of the concerns with long term spaceflight will be potentially negated on the 'long voyage' aspect as people are already talking about how obsolete rockets are for the Mars mission and how new technologies will be deployed to make long distance space travel more closer to earth bound travel in terms of time - and perhaps even instantaneous.
But that still leaves the terrestrial stays on the Moon or Mars an issue with their lower gravity. That is where not only Yoga but Chi-Gung will play a vital role in long term health maintenance and even survival (IMHO). The Chi-Gung practice of 'Cloud Hands' alone is particularly suited to space and low gravity environments as it can be done from a fairly static standing position and gives an excellent boost to the three main central energy channels or meridians (IE: the Kundalini channel) and as such is a no-brainer. As Bruce Frantzis points out in his 'Opening the Energy Gates' book when you energize the central channels it energizes the entire system.
For example, when yoga practitioners add Cloud Hands to a routine it can extend the length and intensity of the routine simply due to the increased level of energy of the practitioner - it's noticeable. The only question is - what type of energy is on Mars or the moon? Mars is famous as 'the planet of War' - an aggressive yang like energy and the moon is known to be more soothing. The astronauts that landed there in the 70's were euphoric and positively energized.
So on Mars they will have to counter the increased yang of Mars energy with more soothing yin like energies in order to mitigate the potential for yang overload which could lead to difficulties among the crews, which can potentially lead to severe morale and even safety issues.
So it's going to be a combination of 'back to the past' and 'back to the future' so to speak that will be the 'future' of space travel IMO. IE: a mix of 'Old school' and 'New school' thinking will be required in order to pull it off successfully. Fortunately, that type of thinking is becoming more commonplace now due to the transformational vibe of humanity (at this time) so this bodes well for success in this area. People are more open to what works - not what experts say 'works'. Practicality and bottom line results are what matter - not what conventional thinking say's anymore.
Once that mindset takes hold of a culture then the 'sky' truly is the limit.
It's just common sense.