I received an Ultimate Sandbag for review a few months ago. I did quite a bit of traveling for work so it took me a while to find the time to really do some workouts with this great piece of equipment. Let me first start out by saying that this "bag" might not look like much but looks can be deceiving.The sandbag is so versatile that it's really the only piece of equipment you need for a full body workout. You can easily adjust how much weight is in the bag and you can use it for a variety of different workouts. The handles are positioned in such a way that you can do bicep curls, over head press, lunges, dead-lifts, you name it. The other benefit is that the weight in the bag is less stable than that of a dumbbell or barbell so it forces you to use your core and keep your balance. Using the Ultimate Sandbag is a great way to train to increase your core strength and engage muscle fibers you don't recruit with normal weights. There are proven benefits to adding instability to an exercise. This is why you see people doing curls and things on bosu balls. The big difference with the sandbag is that you are adding the instability to the load and the muscle you are working not just to your body as a whole. This greatly improves the effectiveness of the exercise on the muscle you are intending to work. Trust me, you'll be a different kind of sore after training with this!!