This Lower-Body/Core HIIT workout is perfect for runners. A HIIT (High Intensity Interval Training) workout doesn't take much time, but gives a lot of bang for your bucks. The workout consists of 6 exercises-3 core and 3 lower-body. Complete each exercise for 20 secs moving from one exercise directly into the next exercise, taking no rest in between. After completing the 6th exercise, take a 1-minute rest break, then repeat the HIIT in the same fashion for a total of 5 rounds. The whole workout takes only 20 minutes. This format jacks up the heart rate ramping up your metabolism. The exercised selected in this workout target the core and all the major muscle groups in the lower body. The only equipment needed is a mat (or carpeted area) and a medicine ball. Don't have a medicine ball? No problem, use a large detergent bottle or fill an empty 1-gallon milk jug with water to use as your weight. Give it a try! Tomorrow I'll post an Upper-Body/Core HIIT for Runners, so check that one out too! Check out my other workouts for runners on YouTube.