The Pilates PRO Chair Max™ is built with precision tolerances to provide a very quiet workout. Although uncommon, in the rare case that the product is making a squeaking sound during use, you can add a small amount of baby oil, olive oil, or similar lubricant to the bushings on the bottom frame.
Looking at the chair from the back, the bottom frame is identified as the bar that connects the left and right vertical frames of the chair. On either end of this bottom frame, there are black bushings along with two bushings in the middle (4 total).
Apply a few drops of oil to each of these bushings to address any noise from the chair. Cycle the pedals a few times to work in the oil and the sound should be eliminated.