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-resistant 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 pounds to meet training needs. Multi-Direction Training: Enables training in various directions to enhance strength and mobility. Adjustable waistband with soft, comfortable, breathable lining, suitable for users of different body types. Multi-Purpose: Enhances sprinting drills and adds variety to workouts. Incorporate hills, directional changes, rows, drags, and more for a full-body workout using this versatile training equipment.