This tool is extremely versatile and can be used in a number of ways. One option is to have yours students work in groups (pairs, perhaps) to create a workout making sure to choose from each group (cardio, core, legs, back, chest and arms) and to try to include some of the more difficult options in addition to "easy" (medium, hard, insane). What's terrific about the use of a tool like this is that students just naturally differentiate, as those more skilled will want to challenge themselves with more difficult exercises. Workout plans can include the exercise name and number of reps or duration. Explaining why they chose the exercise could, also, be included. Students could, also, choose a "self-selected" skill and create a workout that would assist in improving performance of that skill.
The following SHAPE National Standards could be addressed using this tool.
Creates a practice plan to improve performance for a self-selected skill. (S2.H3.L1)
Creates and implements a behavior-modification plan that enhances a healthy, active lifestyle in college or career settings. (S3.H11.L1)
Creates a plan, trains for and participates in a community event with a focus on physical activity (e.g., 5K, triathlon, tournament, dance performance, cycling event).(S3.H6.L2)