This is likely to be the site you are looking for
http://strava.github.io/iD/#background=Bing&map=14.93/153.0330/-27.2279
You can change the background to display the stardard osm layer instead of the satellite imagery.
imagery.
This it the Github site https://github.com/strava/iD
Strava labs site https://labs.strava.com/slide/demo.html#16/-207.12448/-27.35314
Strava Heatmap https://www.strava.com/heatmap#7.92/137.99609/-34.51999/hot/all
* Note that Strava has recently changed their policy regarding the availability of data and there has been recent discussion on the osm help site
https://help.openstreetmap.org/questions/62803/strava-heatmap-no-longer-useful-for-osm-mappers-anything-we-can-do