We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
"BOSU" stands for Both Sides Up, or Both Sides Used. BOSU exercises - calisthenics basically - supposedly train balance and strengthen the core.
It is challenging just to stand on them (either side is wobbly), but I had to do 3 sets of squats on both sides. It is sort of amusing to watch your legs wobble and vibrate under the effect of the proprioceptive storm.
I'll admit that I could not do all the squats on this thing without a light touch of my trainer's hand. Worth doing? I doubt it but it's more exciting than sitting on a chair or watching TV.
As for BOSU balls in my own training, I sometimes do a cycle of BOSU ball pushups (round side down) on the grounds that the shoulder is an inherently unstable joint (the shoulder is a ball and socket joint and the glenoid fossa is very shallow) and these exercises help develop stabilizers. I'm willing to sacrifice some strength gains for stability gains recognizing that I will at least maintain the strength because I am doing some exercise. Along the same lines, I also work in "down" cycles for vertical pressing (overhead presses) using upside down kettle bell presses instead of regular DB or barbell presses (I also sometimes simply substitute in rotator cuff work, i.e. lateral raises, etc.) - overhead work can take a toll on shoulders especially if you have "unfavorable" acromioclavicular anatomy. The older you get, the more susceptible you are to the ravages of overuse injuries, the loading phase of plyometrics (rapid eccentric phase work), new exercises for muscles that you havent' trained in a while, etc. and the longer it takes to heal from injuries.
Used a BOSU extensively after ACL replacement surgery. Great for working on joint stability. Still do squats on it a few years later... I'm a skier and that kind of motion is common in extreme/mogul conditions.
Hey folks, The embossed label on the flat side of the BOSU ball reads that it is dangerous to use the flat side up. Hilarious, and probably something the lawyers made them put there. Interesting reading for next time you're doing BOSU ball pushups with the round side down