The Hard Rock Workout playlist by Stephen Holland has recently undergone a number of additions that are not hard rock, or rock at all, there has been pop and rap added. In my opinion that has really degraded the 'flow' of the playlist.
Is this list still managed by Stephen or has Spotify taken it over and messed it up?
It's a big list with a lot of followers!
Hard Rock Workout
Updated on 2019-02-07
The playlist you mention is made by another user, not Spotify. In its description, it has a email if you're interested in contacting him.
Hope it helps. 🙂