JIN BD Wrist Trainer Ball Auto-Start Gyroscopic Forearm Exerciser Gyro Ball for Strengthen Arms, Fingers, Grip and Muscles

I purchased October 2025. At first, it felt very wobbly and it was hard to understand how to keep the ball moving. I used it occasionally, without pressure to master it, and kept in the top drawer of my desk so when I felt like a "breather" I was tempted to play with it. Fast forward to now, I haven't used it much. However, when I pick it up now, I mysteriously have some sort of muscle memory and know how to smoothly make it work for extended periods of time. Now it is truly fun like learning to ride a bicycle. I can also feel that my wrist muscles are stronger and smarter now. I can feel my wrist muscles getting a work out every time I use it for short periods of time. The moral of the story is take your time and keep trying; it is a very small investment of time and money for a good gain. It doesn't take much; the hardest part is not giving up entirely and being patient with yourself. This device is not a toy. It isn't about constant action. Once the ball starts rolling it is about holding it and distributing the weight like coasting on a bicycle. All the while you make small movements in-between to keep the ball rolling. Only very small movements are used- think about what happens on a bike if you make large adjustments. This wrist ball should be called a wristcycle. You have to grip firmly while fighting to steer. Hang in there! Also, like a bicycle, you need a strong push off. If you don't see the lights when you release the ball after winding then your push off was insufficient.

It's a fun little exercise ball and it will work your forearm. The lights the ball produces when it spins are entertaining but much more so at night and/or in a dimly lit room, in a bright room the lights are barely noticeable. The instructions that came with the ball are a little vague, I ended up going to the online Google video to see how to get this ball started. Many years ago I had a Dyna-flex exerciser (I probably still do in a junk and clutter box somewhere in my house) and without reading the instructions I tried to start this ball the old Dyna-flex way, every attempt failed. I then tried reading the instructions that came with the ball, they were vague and unhelpful. I watched the video on how to start the ball which was very helpful but left out the first step. First, place the ball in the hand which you plan to exercise or to get the ball started. This will help you to get the right feel for the ball, if you wait until after the ball tries to start spinning to figure out your hand placement the inner gyroscope ball will lose all momentum as you are trying to figure it out. Second, place both thumbs on the arrows on the ball. One thumb at a time, push down and forward on the ball, alternate walking the ball in the direction of the arrows with your thumbs. In a very short time you will begin to feel tension building up on the ball, push a little further until the ball feels like it wants to spin back against you. Hold the ball in place with one thumb while you find your grip with the hand you plan to exercise. Once your working hand is in place release your thumb hold on the ball and begin working your wrist, you will know within a few seconds if the inner gyroscope ball has been activated. It took me four attempts to get this ball started the first time, it hasn't taken more than two attempts since.

I've gotten into climbing this year, so I'm always looking for exercises that can improve my forearm and grip strength. A friend recommended these gyro balls to me, and after looking up different models, I decided this one would be good to try. The device comes in simple box. Inside is a card with a QR code linking to a video for how to use it, the gyro ball, a nice case for the gyro ball, and a wrist lanyard for safety. The device itself has a labeled tacky external rubber grip going across the middle third of it. The rest of the exterior is a clear plastic that feels on the cheaper side and somewhat easy to scratch, but after a day of use I haven't actually had any functional problem with it. Shaking device it has a little bit of a plastic rattle. Having never used one of these, I followed the QR code they supplied and watched the YouTube video. To get it started, the center ball of the gyro needs to be spinning, and to do that, you basically use your thumbs to rotate the ball in the direction of the arrows on it (using the grippy strips on the ball) and wind the ball until it's difficult to move. It's important to note (and not mentioned in the video), that during wind up the device must be placed horizontal initially (flat side facing down) while starting to wind up, or the winding won't catch. This is similar to wind up toy cars from when I was a kid. Then while still holding the ball in place with one hand, you place the device in your other hand, grip the exterior, and release the wound up internal ball. At that point the ball is spinning. While keeping your palm parallel to your arm, you then rotate your wrist 90 degrees along the axis of your arm, then back again, and repeatedly keep doing this. The rotational force (centripetal) is transfered to the spinning ball speeding it up, and in return you end up feeling a force (rotational inertia) resisting your movement. The faster the ball moves, the greater the resistance becomes. It took me a few tries, but I've had no problem getting it to work every time since. I saw a lot of reviews saying it doesn't work and that they were struggling, and watching the video or other ones explaining how these work is very useful. The key is small movements along a fixed rotational axis as described. While the rotation I described kicks it in quicker, you can learn to use other wrist rotations to keep it moving as well. Once the ball hits a certain speed (I think 500 rpm according to the video), you'll see rainbow lights on it and hear at speeding up. I found that as it gets really fast it can be quite loud, and I have no idea how it compares with other ones, but it doesn't bother me too much. As for effectiveness, I was really surprised how quickly I felt fatigued in my wrist, forearm near my wrist, and back of my hand closer to my wrist. I don't feel much fatigue in my fingers or anywhere else. I rock climb twice a week at a beginner level, I'm relatively fit, and when I get the ball moving near the limit of controlling it stably, I feel a surprising amount of fatigue in less than a minute currently. After that I usually carefully switch hands (so I'm not using the safety lanyard), and I alternate. Keeping it at slower speeds I can do it for longer. Overall, I'm pretty happy with this so far. I'm sure it will improve my wrist and forearm strength a bit, although I don't know about grip strength. The device seems to be working exactly as advertised, and I'm hopeful that it will continue to perform. I would say it's worth the money. And in case you were concerned like I was at some of the reviews, it would seem a lot of these devices here have mixed reviews when you sort by most recent, but when you read the reviews, they are full of people who claim the device doesn't work or they couldn't get it to work. It's possible there's quality control issues, but considering how common the complaints are even on more popular ones, it's likely people just aren't learning how to use it (which took very little time if people watch the video). Even some of the reviews for this product have videos of people getting the ball spinning, but they're improperly rotating their wrist in a way that is inconsistent with the instructional video. It's very easy to use if directions are followed.

The hand specialist occupational therapist brought these exercise balls to a Parkinson's exercise group my husband attends three times a week. She recommends them and the group members use them for a few minutes at each session. They are a little hard to get going. She showed us how to do it but we still have trouble sometimes. This one I got my husband to use when he is at home works well. She told us to hold the ball upside down so we can see the arrows on the tread of the ball. You slowly rotate the inside ball in the direction of the arrows. This winds something inside the ball and when it becomes difficult to wind the arrows anymore you hold them with your thumb while placing the ball into the palm of the other hand. Once the hand is closed tightly over the ball you take your thumb off the treads and start making circles at the wrist of the hand holding the ball. The faster you rotate your wrist the more resistance the ball gives you. When the resistance gets too much you slow down the wrist rotation and the resistance gets less until the inner ball stops moving. Then you start over again to exercise the other wrist. It gives you quite a workout.

I have done it just like in the instructions and the videos many times and I cannot get it to revolve. I am winding it in the direction of the arrows until I cannot, then carefully placing it in my hand before release and I believe I am revolving it in the right direction vis-a-vis the circular arrows on the bottom for rotation. With eight years of university credit I am not dense, but maybe it's just me. I bought it to restore strength to my hands and I was looking forward to it very much. I will keep trying but I do not expect much improvement. I have general neuropathy as a result of some arrogant jerk of an anesthetist paralyzing both hands giving me ten drugs for a simple lapiroscopic gall bladder removal surgery in 2012. I had some 360 trigger point injections or more to restore function from 2012-2018 and I got back movement but not a lot of strength. So I was hoping it would work but it has not.

Excellent quality for the price!!! Got the Black Diamond . No lights no frills. That’s what I wanted! Easy start, great grip, really gives my shoulder a workout.

I bought the lighted one and the lights do not go on! The ball is also heavy, it worked but almost came out of my hand because it’s heave and due to female small Hand it is hard to keep a good grip around the ball. I can’t image an elderly person using this as it would definitely e too heavy for them to hold more than a minute.

It's pronounced "jeye-roh" such that 'jeye' sounds like the 'J' in jump, and 'roh' sounds like the 'r' in run followed by 'oh' like the 'o' in nose. I was first introduced to the Dynabee -- the original maker of these gyro-type balls. I used it for a long time and it did great things for my forearms, my wrists, and my hands. And then I put it away and last week -- nearly 34 years later -- I ran across it in a drawer. Unfortunately, because of the internal accumulated dust, it didn't spin in the horizontal direction anymore so it wouldn't start. The original Dynabees didn't have an auto-start feature and they came with a pull cord that you could start it with. After getting the hang of it, it was much easier to just roll it down my leg between the hip and the knee to start it. Still, the auto-start feature of this Gyro Ball is a great enhancement to these balls. I took this Gyro Ball out of the box and started it on the first try. It's got a really smooth action and although I can't get it going as fast as I used to get the Dynabees going, it works really well. And not getting it going as fast could just be a function of my arms, wrists, and hands aren't as strong as they were 34 years ago. Still, I was able to get it going faster than 10,000 rpm. It sounds like a jet engine spinning up as you get it going faster and faster. Starting it is really easy when you get the hang of it. Move your hand in large circles, like you're putting on the lid from a large pickle jar. And do it quickly. Once the ball starts, the sound will change and it will start to hum. As it starts to hum, you can make smaller and smaller circles with your hand to keep it going or maintain the speed. Go back to bigger circles and move your hand faster to increase the speed. Keep in mind, slowing it down, its motion will want to rip the ball out of your hand, so hang on tight. With practice, you will find the "neutral" spot where you can hold it and it won't try to rip itself out of your hand as it slows down. From high speed, high RPMs, it can take 30 seconds to slow down and stop. The old Dynabees didn't come with a wrist strap. For beginners, that's probably a nice enhancement. But I don't want it and I don't use it. I work one hand/arm until it's burning so bad that I can't keep going and then I change hands and work the other hand. 34 years ago, I could keep it going non-stop for more than 3 hours that way. Now, my arms are really tired after less than 30 minutes. My goal is to get back to 3+ hours. But the wrist strap just gets in the way when I'm trying to switch hands. So I don't use it. I took off 1 star because I was looking forward to having the LED lights. But the instruction manual that came with it says: Note: not all units have LED lights. That was a disappointment. That's a bit like bait and switch. I bought this one because of the LED lights, and then it doesn't have them. Oh well. My old one didn't either. I'm not going to return this over that.

مجرد ان وصلني المنتج لم يجلس عندي إلا ساعة ونصف و بعدها تعطل ، ما انصح بالشراء نهائيا

No expert on those, but this one is much better quality and cost less than my old one so to me buying this was a happy purchase.

تنكسر بسرعة

This thing is awesome

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