Get Your Heart Rate Up With These HIIT Workout Programs
CNET staff -- not advertisers, partners or business interests -- determine how we review products and services. If you buy through our links, we may earn a commission. Cardio is more enjoyable when you can take a run in a beautiful location or take your time riding your bike around. However, that's not always an option. This is why high-intensity interval training workouts exist. These are fast-paced, quick workouts in a short amount of time, such as 30 seconds at a time with 30 seconds of rest