Not sure about fit@50, but at 47 and 48 worked for me with PRs across the board. Had a slight snag after that but it's coming back. Won teh Scarsdale 5k in 17.57 today. Hopefully more to come when 50 next year. I hope we see you in the fiture!
I'm the Membership guy - Kevin. Why not come down and see us Tuesday 7pm at the VCP track (finish line) or join us for a general run on Saturday at 8am outside the stadium on Broadway - bring some money for breakfast after if you have time.