The Breathing Trainer is a lightweight and portable device designed to enhance diaphragmatic breathing while toning abdominal muscles. It targets deep abdominal muscles, obliques, and the transversus abdomen, making it a versatile fitness tool.

Users appreciate its ease of use and cleaning. One reviewer noted its great value for money and portability. However, some wished for clearer English instructions instead of relying solely on pictures and foreign text.

With three training levels, this device not only improves lung capacity but also boosts metabolism and reduces appetite. It's an excellent choice for those looking to slim their waist while strengthening their respiratory system.

Overall, the Breathing Trainer offers a convenient way to incorporate breathing exercises into your routine, though better instructions could enhance the user experience.