Now it is possible to share a public link with anyone. From the "share" menu of the activity page, click on "Share with friends" and share that link. 

The link is public and doesn't require to have Waterspeed installed or to be a Pro user. It will be accessible by the Web App.

The link will last 30 days. To renew, click again.

To remove the link, click on "Remove".

Note: this feature is available only for Pro users.