Thinking about the work of those 3 astronauts on that test program in FB's post a little more, they would have had a hugely uncomfortable time in there.
The Apollo capsule was a cramped space for three people at the best of times but it was designed for prolonged space flight in Zero G. This means there wasn't a true up, down left and right in the design.
The crew wouldn't have the same freedom of movement in normal gravity and would have therefore spent most of their time sitting or laying on their seats.