First of all the knob to increase resistance doesn't fit properly thus leaving you with no resistance. In less than 10 minutes of use, it overheated to the point that the display stopped moving and the metal part connecting the peddles became burning hot. On further inspection, just that little bit of action caused the plastic around the entrance holes of the pedal stems to start melting out.
I recieved my bench and was very excited. My 1st 5 crunches were murder to the abs....I was sore the next morning and I loved it!!!! It really does what it is supposed to. Directly focuses on your core!!!! You will enjoy but will most definately need to build your strength as it forces you to use a lot of energy.... Happy Crunching
I specifically ordered this because it said it was 75 cm... .it's not. The inflation instructions indicate that "fully inflated" for this ball is 22" ... not 29.5 inches (which is what 75 cm should be in inches). If you're just looking for an exercise ball, that might be fine, but I ordered it to use as an alternative to my office desk chair and it's not tall enough for that. (I'm 5'11" and 75cm was the smallest ball I could use as a chair) That said, it's a nice exercise ball so if the size isn't a big deal for you, it's a good product.
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