On April 2019, the tax authorities have converted moving in a vacuum cabin from 9% VAT to 21% VAT.
Because according to the tax authorities, training in a vacuum cabin is not a sport and therefore falls under the VAT rate of 21%.
According to them, all studios with Vacustep do not fall under the gyms, but fall in the same list as a beauty salon (contact professions)
See the link below: https://www.accountancyvanmorgen.nl/.../belastingdienst.../
Or on the link of the tax authorities [on the page you have to scroll down]
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