Bottled Arm Trainer / Arm Trainer

Nowadays, we begin to pay more attention to the problem of resources shortage in the world.We often use the disposable bottled water. But, we usually abandon the plastic bottle after drinking.
Therefore, I designed the BOTTLED ARM TRAINER for people who wants to exercise their arms in the water. And make people aware of the conservation of resources at the same time.
The major component of trainer is a short PP material tube with two internal threads.We could assemble two empty bottles to the tube when we need to exercise.Or,we could fill up the two bottles to do weight lifting likes lifting dumbbells.
Conserve resources, act from me first.