Glad you asked! If you cannot perform a certain exercise, there is nothing to worry about. We have a button on the workout screen that says "alternate exercise" and you can feel free to click that.
If, for some reason, the exercise doesn't change or you cannot perform the other exercise, in the immediate please do the previous exercise you were able to perform for another round, and feel free to reach out to us after the workout for further instruction and guidance. firstname.lastname@example.org