Straight into spring

I assume that other Join users have seen the message as well? It’s about a challenge for which a training plan is available, and you ride a certain distance on March 7, 8, or 9.

Unfortunately, it’s quite unclear to me:

• If you start the training plan, does your current plan stop?
• Are these rides "in real life," or do you simply ride one of the distances on one of the days? Because with the elevation gain, it’s not possible in some places, or does it have to be done "indoors"?

Anyone who can clarify? Thanks in advance!