According to NPR, the astronauts will now participate in a 45-day progressive recovery program and follow a "structured reconditioning program," which includes two hours a day with trainers to get back to their pre-mission fitness levels. After that 45-day intensive program, they should be back to normal.

A biochemist breaks down challenges that astronauts Suni Williams and Butch Wilmore will face after their long duration in space.

NASA astronauts Butch Wilmore and Suni Williams are finally back on Earth after spending more than nine months in orbit on the International Space Station, splashing down off the coast of Florida on Tuesday evening.