Because it works and I am in pain! ! ! See what happens when you fly past 50 and let yourself go. . I looks simple and it is. I tried one of the wheel rollers a few years ago and I have to say the recoil spring in this makes all the difference to me. It is perfect for those that travel, it goes everywhere with me now and it is easy to get a good work out in a hotel room anytime. I am going to have to buy another one now to leave at home for the other half to have on hand when I'm gone.
Specially for the beginners like me it helps in stretching my goals. As described in the video, the recoil spring helps you continue the motion even when it is hard to do so. This is amazing. It looks good and works perfect.
I bought the orange and green in a medium. I am 5 6 190lbs and it fit perfectly. I love the colors, they're so rich. It looked small when I took it out the package but was pleasantly surprised when I got home and tried it on. A must buy.
So i bought the large and they ended up fitting great!. I wear 32/34 but my waist is 31, and I also have an athletic build.
Very tough and durable. Great backpack! Actually its not just a backpack. This one ranks at the top. Has plenty of room for couple days on the trail, or camping. I've had and gone through a few backpacks. The molle design and attachments are amazing. I have serveral configurations I can use depending on situation.