That’s because you can strengthen every muscle group in the body in just 20 to 30 minutes, and dumbbell workouts are easy to scale to your fitness level. You’ll build strength and fitness quickly and ...
“It just very gently gets you fit,” she previously told Hello! magazine. “It is 12 minutes [long] and they have charts you follow. Each day, you have to do the exercises within the 12 minutes, and ...