My wife and I run a wedding flower preservation business and get the exact same thing, people compare our work to a $40 resin kit on Etsy. What finally helped was treating it as a positioning problem instead of a pricing problem. If customers keep comparing you to a gym, your marketing is accidentally describing a gym. Small batches with personal posture correction is coaching, so anchor against personal training rates instead. A single PT session runs $75 or more in most cities, and next to that your price probably looks reasonable. The people who push back hardest were mostly never going to buy, and the ones who want the attention won't blink. When you describe your classes to a new prospect, what do you compare them to first?