It was these prizes that inspired the biggest turning point in muscle-powered flight's history, and where the work of Dr. Paul MacCready and his various teams would start a new chapter in human-powered flight.

ENGADGET: The Highs and Lows of Human-Powered Flight Alt

Despite the exercise regimen, which lasted at least an hour each day, the old Alpha crew can expect weeks of physical therapy to regain muscle and bone strength lost during the flight, the second longest in NASA history.

CNN: Alpha astronauts: Trip to Mars is doable

The returning Alphanauts can expect about 45 days of physical therapy to regain muscle and bone strength lost during their weightless flight, the second longest in NASA history.

CNN: Discovery brings home Alpha crew