NASA astronauts Sunita Williams, Butch Wilmore stuck in space for over 6 months: How are they keeping themselves healthy?

Sunita Williams and Butch Wilmore, NASA astronauts, are stuck in space for over six months and will come back only next year. But what is NASA doing to make sure that these astronauts are healthy in space? What are the steps taken by the space agency to ensure Sunita Williams and Butch Wilmore's emotional and well-being is taken care of.