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1. Put the belt around the waist, fasten it with a quick buckle, and then adjust the size of the belt by adjusting the buckle. 2. Start running, as the speed test speeds up, the parachute will open to the maximum extent and the resistance will increase. 3. To ensure durability, the products do not drag on the ground to walk. 1.Easily folds down to fit in the carrying bag. 2.Resistance training, increase explosive power, speed and core strength. 3.Adjust your speed training by adding 1-2 resistance parachutes. 4.Quick release strap provides easy release into over speed. Color: Black Material: Polyester Fiber Diameter: Approx. 56 inch Resistance: 25-50 lbs(2 Umbrellas) Adjustable Waist: Approx. 20-42 inch Weight: about 200g Applicable scenes: running, football, to increase the speed of movement The speed chute features a quick-release buckle for that mid-stride, 'shot-out-of-the-cannon' sensation. Unclip mid-stride so your body feels lighter and you can move faster. High quality material, lightweight and durable.