Just consider it an extension of your next training day.
Commit 30 - 40 minutes to lying of the floor, feet up on the sofa. Take long slow breathes, it is great and is actually very challenging. Think about how it is making you stronger for the next sessions.
Remember training makes you weaker, the recovery and body rebuilding makes you stronger.
I don’t do this as often as I should, but when I do I normally have an amazing weeks training.
Re: the 30 - 40 minutes, until you are use to it, 15 minutes is a challenge.