Launch your Music app, tap the For You tab, scroll that top row to the side, and you should see a “Get Up! Mix” slide into view. For me, it was the second item, right next to my Favorites Mix.

If you don’t see it, you can also ask Siri to:

Play Get Up Mix

Both worked for me, even on my HomePod.

As to the mix itself, I absolutely love it. Great selection of songs, all of them in line with music I love. Not a dud in the bunch. Definitely worth checking out.