6 Best HIIT Workout Apps 2026 Free + Paid Tested

“It showcases dozens of different workouts organized by muscle groups, as well as various types of resistance training, including push, pull, and HIIT,” she says. “While these one-off workouts (and warm-ups and cool-downs) are great, my favorite aspect of the app is the Challenge section. Over the years, I’ve done the Begin Again, Alive & […]