If You're Just Starting to Work Out, These Apps Will Jump-Start Your Fitness Journey

Cost: First seven days free. $15 a month, $30 for a three-month subscription, and $99 for a one-year subscription.

The workouts on the My Fitness by Jillian Michaels app are completely customizable: you can choose from beginner, intermediate, or advanced; swap exercises, adjust transition times, select available equipment, and play your own music. The Beat Sync adjusts the beat of your music to the pace of your workout. You can also choose workouts in increments of 10, 20, 30, or 45 minutes. It includes personalized meal plans and daily advice, plus you can track your progress.