Here is another compact tool to work your arms, triceps, and shoulder muscles. The Powerspin Evo uses isometric resistance to tone your body. It weighs less than 1kg but can generate a ton of resistance. To use it, grab the center bar and spin to warm up or loosen your tight muscles. You can spin faster to push harder.
The device gives you a no-impact workout, improving blood flow and strengthening your tendons in the process.