The X2 vest can be used by anyone of any skill levels and all body types. It is the most versatile sports training and fitness tool on the market today. Includes 12 lbs. and can hold up to 20 lbs with an additional 8 lbs. of weights also available. Adjustable to fit all body types. Perfect for men & women of all body typesRecommended for people that need to lose weight and to get in shape. It is Ideal for wellness programs. Use in your aerobic activity or just around the house.The X2 vest maximizes your activities or current fitness program. Strengthens your core muscles and improves spinal bone density in almost all of you fitness related activities. In numerous research studies, where a weight vest was used, significant data has been produced to indicate that the weight vest improved spinal bone density. This is great news to 9.4 million women in the US suffering from osteoporosis. For those who have tried it all, this is the answer.How it works: Your body is acclimated to your weight and it burns calories based on weight, exercise, duration and intensity. When you add weight to your body, more muscles are recruited to support the function of moving the added weight; in turn more calories are burned to support the muscle action. A properly weighted vest will intensify any activity or exercise, increasing the metabolic rate. Ultimately, you can increase your RESULTS and BURN more calories in the same amount of time, making any workout more effective.Uses: Walking, Running/Jogging, Daily Activities, Weight Training, Aerobic Conditioning, Sports Conditioning, and Cardio & Core Strengthening.Comes new in box and complete with exercise poster and instructional DVD!The 8 lbs. additional weights also available.