Size: 30*14*57cm Sandbag Sled Trainer: Helps train sprinters, football players, and other athletes to strengthen lower-body muscles, improve speed, explosiveness, leg strength, and endurance Durable & Damp-Proof: Made of thickened PVC material, waterproof and moisture-proof surface; both the sled and weight bags are built to withstand drags and quick changes in direction, suitable for indoor and outdoor use Weight Adjustable: Includes three removable weight bags; each bag can be filled with up to 10 pounds of sand (sand not included). Customize total weight from 10 to 30 lbs to meet your training needs Multi-Direction Training: Enables training in multiple directions to enhance strength and mobility. Adjustable waist strap with soft, comfortable, breathable lining suitable for users of different body types Multi-Purpose: Ideal for intensifying sprinting drills and adding variety to workouts Enhance your training with hills, directional changes, rows, drags, and more to achieve a full-body workout using this versatile equipment