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Dumbbell has a stationary weight, this concept is that the dumbbell is 5 pounds, if you reuse PET bottle with water on the dombbell,
it can get more weight, the weight is depend on how much water do you add in to the PET bottle.
Southern Taiwan University of Science and Technology
YongKang City, Taiwan
Southern Taiwan University
Xinying City, Tainan County, Taiwan
Jia-Cheng Chang Chih-Chia Kuo Chia-Yin Liao Ching-Yi Chen Hao-Kai Chen Wei-Chu Lin