For even greater variety, try Fitness Builder ($4.99 per month; first month free), quite possibly the mother of all fitness apps. It’s brimming with 758 workouts, including eight ski-specific ones. You can create your own routine too, choosing from some 5,600 exercises. The app helps you schedule, time, track, graph, and share your workouts and body metrics, and you can even submit fitness questions to an exercise physiologist. Seems like the only thing Fitness Builder won’t do is actually work out for you.