The Ready State Virtual Mobility Coach is like having a virtual Kelly Starrett in your pocket.
The description is meant to be general. If you have a very sensitive athlete, you may not need any external loading to start. Adding load is appropriate if it can be tolerated. Using a flywheel is a great way to load if you have one available. The goal is to train the athlete as best you can in the range of motion of the exercise you are choosing that does not cause an exacerbation of symptoms.