Owin.Security.Strava is a OWIN authentication provider for Strava.
Create a Strava app to get your unique Client ID and Client Secret from: https://developer.strava.com
Install-Package Owin.Security.Strava
Add the following to Startup.Auth.cs (VS2013) or AuthConfig.cs (VS2012):
app.UseStravaAuthentication(
clientId: "",
clientSecret: "");