Students can create their own workouts choosing from easy to insane and from each of the groups of cardio, core, legs, back, chest and arms. There are endless possibilities for utilizing with students. Whole class, sure! Share the link in Google Classroom as an announcement and let them experiment?
This resource includes three high-school-level physical education worksheets that could be used as a lesson (or practical review session). These will help to develop the students' understanding of the training principles of specificity and overload, stages of warm-up, and interval training.