Completing 100 push-ups in one day isn't such a difficult task, but when many people heard this announcement, their eyes lit up immediately. The reason they were so excited was because of the next sentence on the announcement board.
"Every player who completes an additional 100 push-ups will be granted one exploration opportunity."
"This exploration opportunity allows players to obtain the rules of a building without entering it."
...
"Hey!"
The tattooed muscular man who first entered the convenience store last night saw this sentence and immediately grinned excitedly, "I knew regular fitness was useful, you may not think I'm supernatural, but I've always been into fitness."
"I might not be good at other stuff, but when it comes to push-ups, even some supernaturals might not match up to me."
"Just 100 push-ups, right? I'll do it with one hand!"