First of all, Hulian's faction and the elders under his command put a lot of importance on the body. Totally different from the rest of the elders who regard the cultivation level as more important. That being said, a lot of training given to the disciples of this faction is based on it.
The next morning, when the sun had barely appeared, the entire Iron and Blood District was woken up by the bells inside all buildings with bedrooms. The rule was that every single disciple should be out in the training field in at most 10 minutes after that. Rean and Roan didn't find it a problem. They were used to wake up early anyway.
However, quite a few didn't have this habit between the new kids, so it was quite hard, and some even got there late. Too bad for then, though. Lateness was punished with extra work.