Trideer Exercise Balls Physical Therapy, 9 Inch Pilates Ball Between Knees for Physical Therapy, Mini Exercise Ball – Yoga Ball, Small Workout Balls for Core Strength and Back Support with Guide

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Price: $9.99
(as of Feb 09, 2026 20:29:33 UTC – Details)


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Customers say

Customers find the exercise ball excellent for physical therapy exercises, particularly for knee strengthening, and appreciate its perfect size and ease of use. Moreover, the ball is durable, with one customer noting it maintains its shape and size, and another mentioning it builds leg strength. However, customers disagree on the ball's firmness, with some finding it overly squishy. Additionally, air retention is mixed, with some saying it stays inflated while others report it doesn't hold air.

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130 customers mention quality, 116 positive, 14 negative

Customers find the exercise ball to be of good quality, describing it as a great Pilates ball.

Good quality, easy to inflate. I like the 9 inch size for exercises with ball between legs. Also works good for cores exercises. Great price too.Read more

Great product! Made really well and comes with extra plugs and a pump and exercises too.Read more

It’s a great exercise ball like the ones I’ve been using in rehab. BUT THEY WERE ALREADY INFLATED….Read more

Great quality and I love the color. Feels great. Easy to inflate. Perfect for my needs. Thank you!Read more

118 customers mention physical therapy, 116 positive, 2 negative

Customers find the exercise ball effective for physical therapy, particularly for Pilates, leg exercises, and knee strengthening.

Product works well for me. Easy to inflate and does not leak. Great for physical therapy.Read more

Good quality and great for exercising. The color is as shown in picture. Comes with a device to adjust air (easy to use)….Read more

Great for physical therapy exercisesRead more

I am doing PT and use this ball for my exercises at home. Perfect for core exercises.Read more

70 customers mention works well, 67 positive, 3 negative

Customers find that the exercise ball works well for most exercises, particularly for knee support, and one customer mentions it effectively promotes hand opening and closing.

It's exactly what I ordered and works great. Was on time too and easy to blow up.Read more

Works well for being able to do PT exercises at home after hip replacement surgery.Read more

Got this for back exercises. Works fine.Read more

Works as advertised. Pretty good quality, easy to inflate. I use it for my home based physical therapy.Read more

62 customers mention ease of use, 60 positive, 2 negative

Customers find the exercise ball easy to inflate and use, with one mentioning it comes with tools for filling and another noting it's a convenient home gym tool.

Good quality, easy to inflate. I like the 9 inch size for exercises with ball between legs. Also works good for cores exercises. Great price too.Read more

…Comes with a device to adjust air (easy to use). Retains air and has good texture to the touch.Read more

It’s as advertised. It will hurt your feelings during a workout. Easy to pump up. Hasn’t deflated. The texture keeps it from slipping when sweaty….Read more

Bought it for rehab after arthroscopic knee surgery. Easy to inflate and use.Read more

50 customers mention size, 41 positive, 9 negative

Customers like the ball's size, describing it as perfect for exercises and small but mighty. One customer specifically mentions it works well for knee compressions.

…I ordered one for myself. It is not hard. Perfect for my therapy. Perfect size and retains air.Read more

Right size once inflated with enough flex to squeeze in incriments.Read more

I like the ball and it’s the correct sizeRead more

This is a good 9 inch exercise ball to use for Physical Therapy. It is holding up very well.Read more

34 customers mention durability, 28 positive, 6 negative

Customers find the exercise ball sturdy, with one mentioning it maintains its shape and size over time.

…It was easy to inflate and stays inflated. It is durable and easy to use. Also comes with exercise instructions.Read more

…It's sturdy, looks nice, and wipes clean if it gets dusty. Overall, I really like this. It's my second one, my first one got hijacked by my dad….Read more

…It’s seeming to be very durable and the right size for most rehab exercise exercises….Read more

Strong and flexible small ball that can be used to strengthen muscles.Read more

109 customers mention air retention, 53 positive, 56 negative

Customers have mixed experiences with the ball's air retention, with some reporting it stays inflated while others find it impossible to fully inflate or say it doesn't hold air at all.

Returned after one week. Difficult to inflate with the small straw that is in closed. It did not hold air.Read more

The ball was easy to blow up and retains the shape while exercising. Fabulous seller too!!Read more

…a single session, but you have to refill it the next day as it deflates easily….Read more

…I like the size of it. Not too big, not too small. Holds air for a long time. I have had it for going on three years and have only refilled it twice.Read more

34 customers mention firmness, 20 positive, 14 negative

Customers have mixed opinions about the firmness of the exercise ball, with some finding it soft and nice to use, while others describe it as stiff and overly squishy.

…The ball is easy to hold because of the material it is made from. Soft, pliable and holds the air longer than previous.Read more

…Also ball was very hard. Very disappointing.Read more

Great soft ball!Read more

Would not recommend this. It does not stay firm like it should go to Walmart.Read more


PT / 4 Square

5 out of 5 stars

PT / 4 Square
Great for my PT needs. Bonus: also a perfect basement 4 square ball for nieces and nephews (see photo)
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Top reviews from the United States


  • MJS

    5.0 out of 5 stars

    Buy This

    Reviewed in the United States on December 23, 2025

    Color: Forest（with pump）Verified Purchase

    Good quality and great for exercising. The color is as shown in picture. Comes with a device to adjust air (easy to use). Retains air and has good texture to the touch.


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  • Frank

    5.0 out of 5 stars

    Great quality at a reasonable price

    Reviewed in the United States on December 26, 2025

    Color: Forest（with pump）Verified Purchase

    Excellent example of a Pilates ball for my physical therapy routine. Good quality and easy to inflate. Thanks!


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  • John VM

    5.0 out of 5 stars

    Works as advertised

    Reviewed in the United States on December 20, 2025

    Color: Forest（with pump）Verified Purchase

    Works as advertised. Pretty good quality, easy to inflate. I use it for my home based physical therapy.


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  • Amazon Customer

    4.0 out of 5 stars

    It's a 9 inch exercise ball and it doesn't cost very much.

    Reviewed in the United States on October 26, 2025

    Color: Green(With Inflation Straw)Verified Purchase

    The product seems OK. I've only used it for a few days and it already needs more air. The instructions are ridiculous. I did figure out how to "blow up" the ball. It isn't intuitive that you need to do that. So take the straw, insert it into the opening and blow. The next challenge is getting the plug in place without losing air. Good luck with that. It is a 9 inch exercise ball. Doesn't smell gross. I have been able to use it for my PT exercises.

    5 people found this helpful

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  • JCD Industries, LLC

    5.0 out of 5 stars

    Excellent Product & Seller

    Reviewed in the United States on February 6, 2026

    Color: Forest（with pump）Verified Purchase

    I am waiting on my husband to come home to blow it up so I can start using it. I had a hip replacement and was using this for physical therapy. Now that I have one of my own, I can strengthen the muscles in my hip and leg.


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  • kfromWisconsin

    5.0 out of 5 stars

    Great for home PT

    Reviewed in the United States on December 12, 2025

    Color: Green(With Inflation Straw)Verified Purchase

    I use this for shoulder mobility exercises and it has held up well. It slowly loses air, but that is to be expected.


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  • HB

    5.0 out of 5 stars

    This works, very helpful.

    Reviewed in the United States on December 2, 2025

    Color: Green(With Inflation Straw)Verified Purchase

    Love this. My insurance refuses to pay for physical therapy. I have scoliosis, stenosis and spondylosis and needed something to strengthen my core. This is perfect and the instructions are very clear.


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  • Anne J. johnston

    3.0 out of 5 stars

    Ball evaluation

    Reviewed in the United States on January 24, 2026

    Color: Green(With Inflation Straw)Verified Purchase

    I. Did not understand how to inflate it. I could not get the hole cover off to insert the pump stem.


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Product Summary: Trideer Exercise Balls Physical Therapy, 9 Inch Pilates Ball Between Knees for Physical Therapy, Mini Exercise Ball – Yoga Ball, Small Workout Balls for Core Strength and Back Support with Guide

From Trideer
Boosts Joint & Muscle Rehab: This Pilates ball, as ideal pieces of physical therapy equipment, works wonders in joint and muscle rehabilitation exercises (esp. back rehab!). It speeds up the recovery of a wide variety of body parts including the ankle, knee & hip joints and back & shoulder muscles, by improving posture, balance, and core stability, and in a safer way.
Unlimited Variety of Uses: These swiss balls for exercise are an extremely versatile tool to help strengthen your whole body. They add an extra level of stability in yoga, pilates, barre, fitness training and rehab or recovery programs so as to enhance your practices. Also works great for releasing deep layers of muscles and fascia pre- and post-workout at home, in the gym, or at the physical therapy offices and rehabilitation centers.
Easy to Inflate & Store: The 9 inch mini exercise ball inflates in seconds using the included tube. Make sure you quickly plug it tight using the included plug after inflation to avoid any air leaking. The small size of the pilates ball makes it easy to store at home or take with you to classes, therapy sessions, or when traveling.
Anti-Burst & Anti-Slip: These 9” physioballs are made from long-lasting PVC free of phthalates. The physical therapy ball does not contain heavy metals (Pb, Cd, Hg, etc.) or 10 types of harmful heavy metal salts. The textured anti-slip surface delivers a firm and comfortable grip for your peace of mind when working out.
Avoid placing the Pilates ball on wooden furniture for long periods to prevent damage.

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