Okay, I've been away and done some thinking. It could be possible for me to split this RP into two scenarios.

One, involving the slower posters, and one involving the faster posters. The situation in the gym would provide an opportunity for the group to be split. 

One group would have a 48 hour post rule, and the other a week post rule. 

The only draw back would be that interactions between the groups might be a bit dodgy. 

Thoughts?