To learn more about what's happening on the International Space Station at any given time, check out NASA's frequently-updated ISS blog or their page about the research and development work happening on ISS.
Depends on your body type and metabolism and your routine. But usually it takes around 3 to 4 weeks for visible results. For me it took me a couple of months to actually see any progress visually.
If you've ever gone for a run after a stressful day, chances are you felt better afterward. The link between exercise and mood is pretty strong, Otto says. Usually within five minutes after moderate exercise you get a mood-enhancement effect.. But the effects of physical activity extend beyond the short-term.