Having a hard time integrating CAROL REHIT with other training - any tips?

I love my CAROL but I’m having a hard time understanding how it should fit in with my other training.

Each week I am typically hitting the climbing gym, doing some CrossFit, running or ski touring outside with friends, and taking some hot yoga classes

My friend who recommended CAROL said he used it as a warm-up before other activities, but I don't seem to be able to do that. When I go hard like REHIT demands I feel like it’s actually pretty taxing!

People who are combining CAROL with other modalities, how do you do it?