When entertainment was begun, during the Depression, it was supposed to take people's minds off reality. People could sing, dance, act or do anything. It was the type of entertainment that was available. ↗
It's a question of spreading the available energy, aerobic and anaerobic, evenly over four minutes. If you run one part too fast, you pay a price. If you run another part more slowly your overall time is slower. ↗
We're on the same radius from the Earth, and then we start to swing around to where we're ahead of them on the velocity vector, so we come in relative to the station from this forward velocity position and dock on to the forward end of the Lab. ↗