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| Customer Reviews: | | Average Customer Review: ( 208 customer reviews )
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Most Helpful Customer Reviews
19 of 20 found the following review helpful:
 You'll Have a Ball With It! Dec 29, 2010
By L.W.
There are two reasons to get one of these. The first is if you want to strengthen your hand and arms. The second? To have fun!
First reason one. If you're looking for a way to strengthen your arm and hand, the powerball will help you with this. Specifically, you have to hold on to it, so it works your gripping muscles of the hand. It also works the wrist muscles, because you have to rotate your wrist to keep the thing going. Lastly, your biceps will get a workout as well, because your biceps muscle helps turn your palm up (supination), which is one of the motions involved in keeping the gyro spinning.
I can't really see anyone with an acute wrist/elbow/arm injury using this device, as it would probably be just too vigorous a motion. In other words, say you had really bad tennis elbow- I think the powerball would likely make it worse in the beginning- but maybe use it later on as it got better- definitely this would be a more advanced activity to do to get fully back into shape. Exercises like those outlined in Treat Your Own Tennis Elbow would be better overall to use than to jump into something like a powerball. Mild cases might do alright.
On the other hand, if you don't have an injury and are just looking to get the above named muscles stronger and in better shape, then the powerball will certainly benefit you. Because it can spin progressively faster and faster as you get stronger, the powerball can provide you with a progressive resistance of sorts to get you stronger and stronger over time.
Now the second reason to get a powerball, for fun, really needs little explanation- it's just too much fun seeing how fast you can get this thing spinning! Perhaps the only non-fun thing about it is that it does take a little practice to get the hang of it, and when you're starting out and can't keep it spinning, well, that can get a little frustrating. However, it doesn't take long, and one tip that helped me in the beginning was to keep your elbow straight as you're practicing getting the technique down.
A cool toy and useful tool, don't think twice- give it a try!
80 of 99 found the following review helpful:
 A little good, a little bad Aug 14, 2007
By Mark Twain
It's funny how so many of the reviews posted here are either 5-star "its so great! its so easy!", or 1-star "its a piece of worthless junk!". The reality is that, for most of us, its going to fall somewhere in between. I bought one of these a week ago from a local sports shop, thinking that I could bring it into my office or with me when I travel, and use it while I read over papers and reports. Any chance I can get to multi-task... After a week of use...
Pros: I can easily see how this would provide a decent forearm workout. When I use it for 4-5 minutes in one arm I can really feel those muscles have indeed been worked. Consequently, I would say that it works more or less as advertised, meaning that it does what it says it will do (strengthen your forearms, hands, wrists, fingers, etc.)
Cons: Despite some of the promotional material, it is not the easiest thing in the world to get started. I tried the "handstrike" methods to no avail. After a week of using it several times a day, I am now focusing solely on starting it with the string. I am only able to get it up to truly high rpm's once out of every 5-6 tries; however I can almost always get it up to the point where it will run for a minute or two. The motion involved is not quite the simple "back and forth" that is advertised on the package or in the "instructional" dvd that comes with it. It seems to be more of a circular motion, and it seems to be important to not try to force the gyroscope to spin too fast too quickly, you need to work with it especially at the beginning. And to some of you who say it is ridiculously easy to use; yes I *can* tie my own shoes, I *am* reasonably well coordinated. Please simply consider yourself lucky that it worked for you so easily rather than insulting the rest of us.
Consequently, at this point, it is definitely *not* the tool I was hoping for in that I really need to pay attention to it in order to use it. I can't read, look at my computer screen, have a phone conversation, or really think about anything other than the gyroscope. Hopefully this changes over time.
Additionally, those folks who want to use it at their workplace should know that it is *not* silent, the gyroscope absolutely makes a small noise when it gets up to high rpms, which may be distracting in some work environments.
So, does it strengthen your hands & forearms, probably. Is it as easy to use as some suggest? Definitely not. However, I would hazard a guess that most people could develop the skill required with a few days or weeks of steady practice. I'll hope that works for me at least.
11 of 14 found the following review helpful:
 Junk Aug 27, 2008
By rogersdan
I've owned three of these. They initially work well but none have lasted more than 3 months before they become out of balance and cease to function as designed. I emailed the company once and complained but never heard back from them.
18 of 24 found the following review helpful:
It's not junk--you just don't know how to do it Jun 23, 2005
By klbmarsh
"klbmarsh"
I bought mine today. I played with it and read the instructions and just couldn't get it going. Then I got frustrated and shook it really hard, and off it went. You have to use the string (or your hand) to get the thing in the middle spinning. Then, holding it like a baseball, twist your hand left and right as if you're using a screwdriver REALLY FAST. In seconds you'll notice the gyro going and you can make it go faster or slow it down by not twisting. Hopefully it won't make my tennis elbow worse instead of better, which is why I bought it.
32 of 44 found the following review helpful:
Awesome Exercise Device Jul 29, 2007
By citan-uzuki
"citan-uzuki"
I first encountered one of these devices back in college, twenty years ago. One of the tennis players had one. He showed me how the device worked. I remembered being amazed by it back then. Eighteen years later, I ended up working in a job that required a lot of hand strength. I remembered the gyro and searched for it on the internet. I found it here, and ordered one.
I've had this one for over a year now. I do not use it regularly, because it does take up a lot of time, and it is a challenge to get the rotor started. It did improve the strength of my hands, wrist, and forearms. Especially my fingers. It's definitely effective. However, it will not completely replace those grip exercisers such as the ones by Valeo. The Dynaflex is best used as a supplement to traditional free weights and to the regular grip exercisers. The Dynaflex will reach and stimulate those smaller, specialized muscles that the core exercises fail to reach.
You can probably incorporate the Dynaflex into your routine workout. However, the Dynaflex will not help you build the muscle mass in your forearms. The Dynaflex will benefit your power and coordination. As such, you will receive most of the benefits even if you only use it once a week.
This is not the tool for adding muscle mass. But it is effective at getting to those muscles that core exercises miss. That might be the reason why these are so popular with tennis players. I suppose the Dynaflex works by requiring you hold your arms steady as the forces generated by the gyro increasingly makes it more difficult to do so. Having played a little bit of tennis, I can see how this can help you in keeping your forearm steady.
The main challenge here is getting the device to start. But once you get it started, it is relatively simple to keep it going. You might also consider the latest version. It comes with the battery-operated Power Dock. The Power Dock will start the rotor for you.
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