Can I register with something other than Facebook or Strava?
Challenge Hound currently only works with Facebook and Strava. You can just create a free Strava account and use it only for login purposes. You do not need to use the Strava app or features, just use it as a log in mechanism. Once you login, you can manually enter within Challenge Hound. Recording activities with Strava is a very nice add-on though and removes the need to manually enter anything.