These 10 minute sets are just perfect for working out when you don't necessarily want to do a whole 45 - 60 minute routine. You can choose to do one, all, or a combination of 10 minute sessions of your choice. I find I usually do 4 routines of 10 minutes each. Some at first seem overwhelming, (like the kick box cardio), but after a few tries, you will get the hang of it. I recommend this product. A really good workout.