For the second set the ring plank is a place holder, I want you to try the TRX 40/40 challenge. There is a video that explains it perfectly, you will attach your TRX to your doorway tho. Video: https://m.youtube.com/watch?v=UUOw5LirhZY
Do this workout with the best exercise equipment. We recommend using a bluetooth chest strap heart rate monitor or a smartwatch for more training optimization & performance tracking.