Note: This sandbag is hollow and needs to be filled by yourself. It is recommended to fill it moderately. If you only fill it with heavy objects such as sand, don't fill it too full, as it may affect the use of the wall target. Comparison between Wall Target Sandbag and Ordinary Sandbag 1. The wall target is more portable than the sandbag and can be hung on the wall or a stool. 2. The reaction force of the wall target comes from the whole wall. Compared with the sandbag, it can better develop penetration. Since the wall doesn't move like a sandbag, its overall bearing capacity is greatly enhanced. There is a lot of wall target training content in Jeet Kune Do. Bruce Lee also used the wall target as the main training tool during his lifetime. He often placed two or three sandbags upright (referred to as "double - section, triple - section"), or hung multiple sandbags on the wall respectively, filled with sand, gravel, beans, scrap steel or iron sand, etc., and then punched them in turn to feel the different sensations when the fist hits different objects, that is, the sensations of the human body when hitting different parts. The wall - attached sandbag is the best equipment for practicing boxing techniques. You can practice various boxing techniques with the wall - attached sandbag. For Jeet Kune Do practitioners, first, keep a distance of about 17 inches (about 45 cm) from the sandbag, and then punch with the elbow force. When punching, the body must be relaxed, and the arm muscles should not be tense. You can punch fifty times first. If you feel pain in your fist, stop punching immediately. Kicking the sandbag is a more advanced skill training, which can exercise footwork during the process. Especially for the three kicks in Jeet Kune Do, you must cooperate with breathing, make a series of coherent actions with the same foot, and try to keep the body balanced without letting that foot touch the ground. Product Details - Color: Off - white - Material: Canvas - Size: 40×40 cm - Weight: 160 grams - Package content: 1 empty sandbag It only contains the above package content and no other products. Note: Light reflection and different displays may cause slight differences between the color of the item in the picture and the actual object. A measurement error of ±1 - 3 cm is allowed.