A 20 minute non-stop muscles and heart rate pumping workout for every intermediate/advanced trainer. This routine will not only burn stubborn fat but it will also improve your fitness level and muscular endurance. This workout is doable for strong-beginner, all you need to do is follow the modification. Warming up your body before training is crucial. I would recommend everyone to spend at least 5-10 minutes doing some dynamic warm-up on light to moderate intensity. I would personally go through 1 round of this exercise routine with slow-moderate effort before I start pushing myself hard. As a warm-up, you can do Round 1 with a slow-moderate pace before you start your actual working pace.