Here's my project – it's exactly what we build over the course of our class. 

We have:

• Speak actions to announce instructions (and motivational shout-outs!)
• several Wait actions corresponding to the Effort and Rest instructions
• a List action to hold the exercises that I want to do for each round
• a Repeat With Each action that contains everything that needs to happen per exercise in my List
• a Repeat action containing the whole set plus a 4-minute rest between sets
• two Set brightness actions, one to lower and another to restore the screen brightness for during and after the workout, respectively.

If you have any questions at all, please post them in the Discussions area!