Massager

If you have sitting work and you are over 35, than you start to face blood circulation problems.
Sport activities are very important to prevent that, but some people are not capable to do physical activities. Than you can use massage services or do it your self by rolling and making top layers to receive vital blood circulation. This way you can also help to recover damaged body parts.
With this roller massager you can massage back, shoulders, but, legs, feet.
For roller I use tooth sticks and solder to connect both parts. Chose profile you like, I personally prefer spiky one.
Additionally you need 5mm rod wooden or aluminum and make 2mm drill at the end to mount end part. If you have better option, you welcome to make your version!

Here is video: https://youtu.be/s0-vF13eW_M