15-Minute Full-Body HIIT Workout From Heather Robertson
No equipment is required for this 15-minute full-body HIIT workout. Robertson walks you through five bodyweight exercises that you'll be doing for three rounds total — each set is 40 seconds. The five moves are as follows: up and out jacks; push-up, shoulder tap, and plank jack combo; in and out squat hops; inchworm bear hops; and boxer burpees.