For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
Dropbox - Online Sync and File Sharing
Fit Meet - Find patterns for any sports or activity.
Google Drive - Access and sync your files anywhere
Rovo - Rovo – Find Sports Buddies is a simple and easy-to-use social app that is designed to meet new strangers for sports.
Mega - Secure File Storage and collaboration
FitMatch - FitMatch – Find Workout Buddies and Fitness Friends is a complete social communication app that connects you with people who share their fitness stuff.