Portal For Gym (can be WP plugin but not a must)

Hi there. Looking for a portal where gym members can login and put in how many miles they have run.

Basically one of my local gyms are doing the Run The World challange where they run the same amount of miles of the world in a year together.

So what is needed is somewhere where they can login and enter how many miles they have run.

So when they login they should see a graph of how many miles they have run and also a combined amount with all the other members.

Would be good to hear some other ideas of features that could be used on this also.

Looking for this asap!

Thanks,

Jamie