Title: Not 75 cm.
Review: I bought this ball because I have a bad back and want to use it as a chair to help with spinal stability. Therefore, achieving the 90 degree angle between my hips and legs is *very* important. I bought the 75 cm ball because I am relatively tall. I inflated it, using a level and a hashmark on the wall to ensure that it was inflated to the proper size. At 65 cm., I was frightened to keep inflating for fear that I might over-inflate and injure myself. I took it inside and when I sat on it (at 140 pounds) it barely makes a dimple. Thus, I know I am at about max capacity. The angle is a little shy of 90 degrees so I guess I'll keep the ball until I can find a better one. Just note, if you are looking for a 75cm ball, this is not it (and just FYI - the box *does* say 75cm).
Is this product review negative?