Mo Wen chose this practice hall for the purpose of practicing martial arts teachings.
He considered for a while that he did not have a lot of Contribution Credits on hand. In his current situation, he could only keep practicing for three or four days. If he chose a Great Hall to help his Cultivation have a breakthrough, three or four days' worth of time would not produce much of an effect.
However, this Martial Arts Meditation Hall was different. Using meditation methods, practitioners could "extend" time 100 times longer, causing their cognition to be completely active. If they studied martial arts teachings during this time, a day of studying would be equivalent to a year of normal time.