This is your personal heatmap, using your data from Strava. Two things are required for it to work:
1) You must be logged in, and
2) You must have linked your Strava account.
It will initially take quite some time for all your rides to show. Rides are imported in batches of 200, every 15 minutes, and occasionally the process can be rate-limited by Strava, slowing it down further. I suggest you kick the import off (link your Strava account in the WillCycler’s Dashboard) the walk away for a day.
The Strava Heatmap is only available to logged-in members of the site. Also, your heatmap is viewable only to you. There is no way to share it, short of taking a screenshot. This is intentional. Finally, you can hide individual routes, by clicking the line, then selecting to hide it in the pop-up.