1/10 0 Points 0 Streak Health & Fitness Which of these is a key benefit of high-intensity interval training (HIIT)? Prolonged recovery time Minimal calorie burn Quick improvement in cardiovascular fitness Reduces flexibility Other quizzes Trending, related, and recent quizzes you may be interested Health & Fitness Which exercise is most effective for improving core strength? Play Now Science What phenomenon causes the Northern Lights? Play Now History Which kingdom was united under King Alfred the Great? Play Now Entertainment In Pixar’s Inside Out, which emotion is voiced by Amy Poehler? Play Now Sign up for Quiz Daily! By subscribing to Quiz Daily you are agreeing to our Privacy Policy and Terms of Use. Sign up