In the video above, I demonstrate how to use gym boxes to perform a split squat. The split squat is similar to the lunge in that you target the same muscles; the quadriceps, hamstrings, gluteus maximus and adductor magnus when you perform the exercise. The difference between the two, however, is that your rear foot is maintained at rest throughout this particular exercise, meaning it does not move as you undertake it. Watch the video and see what I mean. I like this exercise, as it targets one leg at time and gives you a chance to work on your coordination at the same time. When you build your workout, be sure to add in something like 4 to 5 exercises options for each part of your body so as to surprise your muscles and to avoid getting bored yourself while you exercise.