Both sandbags and speed balls consume calories to lose weight. The difference lies in speed, quick effect and hard reduction in the later stage. Sandbags need you to stick to them every day, which is slow to take effect, but it is good to have an effect. It is also easy to build muscles. Children who don't want to exercise muscles should use this method with caution. As for boredom, I prefer long-distance running, which is easy to cultivate leg muscles, but long-distance running can vent emotions, sweat quickly and detoxify easily, but I am a little tired.