Mark Lauren is the master of body weight strength workouts. He has written books about it, he has created workout DVDs, he has both an app and a website in which he streams workouts. His background is military–he spent time in the military then he trained Special Ops units. He also has a martial arts background. I’ve read his books and done his workout DVDs. I find them all excellent. Mark is another trainer who does every workout from beginning to end with the home exerciser. He does everything at a controlled pace and his form is perfect. He has a very calm and encouraging presence that I find motivating.