Dumbbell is an auxiliary equipment for weightlifting and fitness. Because there is no sound during practice, it is named dumbbell. The weight of light dumbbells is 6,8, 12, 16 lb (1 lb =0.4536kg) and so on. The weights of heavy dumbbells are100,550,300 kg, etc.

In addition to iron dumbbells (the main material is cast iron, and some are covered with plastic and glue), there are also wooden or plastic dumbbells. There are two kinds of fixed weight and adjustable weight. ① Dumbbell with fixed weight. ② Adjustable dumbbell (increase or decrease weight).

At present, the special floor materials for fitness dumbbell area are PVC/EPDM/ rubber, and the thickness varies from 3 to 15 mm; There are many forms such as coil, block or lock splicing;

Its ground construction is convenient, as long as the grass-roots ground is directly laid after the completion of conventional construction, it can be seamlessly connected and the overall effect is good. And that hardness and elasticity of the part are moderate; Generally, it can bear the impact of dumbbells, and the dumbbells can be stressed as a whole when they land, so the surface damage is very small. The performance of ground materials meets the requirements of environmental protection and use. After installation, there is no need to wax, and it can be as clean as new only by general daily maintenance.