New for 2007, the Twist Pro Vest is the ultimate training tool. Weighted vests are a popular training tool for athletes or anyone who wants an enhanced workout. The idea is simple; if you condition your body to exercise with an added load, you gain enhanced endurance, quickness and speed when the weight is removed. Weighting the core of the body is also safer to your joints and back than ankle or wrist weights. Benefit in using a weighted vest in such activities as running, biking, hiking, weight lifting or any sport. The 2-piece design, offers an elastic Velcro waistband and is adjustable for torso height and waist size, holding the vest securely on any size user. Ultra comfortable, durable, completely adjustable, the vest will not affect arm motion, balance or breathing. Available in 20 to 40 pound models, and adjustable in 1lb increments.