With this routine I've taken squatting to a higher intensity level. Using Dumbbell's we squat continuously for the 55 minute session, without any breaks. When incorporating upper body exercises we will achieve a minimum of 2000 squats. I also have a routine which us just squats and with practice we can increase our numbers to 4000 squats. These are both low impact approaches (easy on the hip, knee and ankle joints). I would suggest any of these as an alternative to running. By using the big muscle groups in the lower body we are burning lots of calories and because of the extended squatting session we are also executing an aerobic workout. Cardio or aerobics burns stored body fat. It takes the body about 20 minutes to get into the fat burning zone so by increasing the duration and using the big lower body muscles it's a double win situation.