Bests & Worsts Reviews from Amazon

Various back and hip pains had me looking for a replacement for my Aeron chair. (Can't believe what I paid for that thing. Talk about effective marketing...) I work at my computer 8 to 10 hrs. a day, five to seven days a week. Extensive research brought me to the exercise ball. Luck (and the good Gaiam name) had me choose this ball. But I got the wrong size at first. Many sites recommend 65 cm for those 5'9" tall. This is WAY too short. I got 75 cm, and it seems to be the perfect height for me, and for anyone of any height, actually. Otherwise you're way too low. My posture improved instantly. It was relatively easy to use, and by the end of the first week I was totally and completely in love. I sit at my computer 12 hrs. a day, 7 days a week. This thing makes me use my abs, legs, and back muscles all day long, but in a way I just don't notice. "Active exercise" is the term. I'm secretly hoping that my legs, butt, and abs will slowly but surely become tighter and more toned than ever. (Hey, a girl can dream.) And, as many others say here, I am much less tired at the end of the day. This ball is a great product. Buy Gaiam! Everything I've gotten from them has been the top of the line. EDIT Bonus benefit: Weight loss. It's now 10 days, and I've lost a tiny bit of weight every day while on the ball. Makes sense--my back/thighs/abs are getting a real workout. At first, I was tired after a couple hrs. on it. Now I use it all day before I'm tired. Am confident that as I shape up, the tiredness will disappear. And the disappearing weight is FANTASTIC. I feel so light on my feet!