I usually lack exercise even without the influence of covid-19, so I decided to make a tool to solve it.

Models with cavities are usually very difficult to remove the support, but you can use a water-soluble support material to solve it and create a training tool that suits your abilities.

You can put up to 500g of water inside, but if you want to make it heavier, try another material.

If you can't use a water-soluble support material, don't worry.
There is no problem if you train as it is.