As a trail ultrarunner who lives in the city of Denver, I want the ability to customize my workouts with different sports so that I can more seamlessly transition between sports/workout during my overall workout. For example, running cross training - if i have a specific run-swim-run w/ distinct sets in mind. Or if i have a outdoor run - treadmill run - outdoor run workout in mind (since denver is actually not a hilly city so i like to do outdoor speed workout, jump on the TM for some hills, finish up outside).