You can get a pretty good workout plan from a chatbot, but the tech is also being incorporated into all kinds of existing fitness apps, from Apple's Workout Buddy, which motivates you through earbuds, to the Fitbit AI health coach, to Peloton's AI-enabled camera that tracks your form.

Nicole Nguyen, personal tech columnist at The Wall Street Journal, gave some of the most popular ones a spin. She spoke with “Marketplace Tech” host Meghan McCarty Carino about her experience.