Yes4All Half Ball Balance Trainer 880 lb
- Size: 23.5 inches
- Warranty Description: 1 year
- Item Weight: 15.21 pounds
- Maximum weight recommendation: 880 pounds
Last refreshed Jul 5, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A high-capacity, non-slip balance dome that fits well into bodyweight and core routines built around standing instability work.
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ASIN: B084NWC2M3Model: SJ31Category: Exercise Balls
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Overview
The Yes4All SJ31 is an 880 lb-rated PVC half-ball balance trainer with a textured dome and non-slip base, built for step-ups, planks, lunges and pushups rather than seated stability-ball work.
Because it's a half-dome rather than a full round ball, this trainer is built specifically for standing and floor-based instability work, not the seated bouncing exercises a full stability ball supports. The listing highlights the non-slip base and textured surface as the features meant to keep footing secure during dynamic moves.
- 880 lb weight capacity
- Non-slip, textured base and dome
- Supports step-ups, planks, lunges and pushups
- Durable PVC construction
Who it's for
Fits people adding balance and instability training to an existing bodyweight or core routine, using moves like step-ups, planks and lunges. Not the right pick for anyone wanting a full round ball for seated core work or physical therapy bouncing exercises.
Pros and cons
- 880 lb rating supports a wide range of body types
- Non-slip base helps it stay planted during dynamic moves
- Textured dome surface aids grip and traction
- Half-dome shape isn't a substitute for a full stability ball
- Performance depends on getting inflation firmness right
- No exercise guide is mentioned with the listing
Performance notes
The domed half-ball shape forces continuous small adjustments through the ankles, core and stabilizer muscles during static holds or dynamic movements like step-ups and pushups. The textured dome surface and non-slip base are meant to keep footing secure on that unstable surface, and the PVC construction is rated to support up to 880 lbs.
Specifications
| Brand | Yes4All |
|---|---|
| Model | SJ31 |
| Dimensions & fit | |
| Size | 23.5 incheshigher than 67% of 34 exercise balls |
| Item Weight | 15.21 poundshigher than 100% of 38 exercise balls |
| Maximum weight recommendation | 880 pounds |
| Item Dimensions L X W X H | 23.5 × 23.5 × 7.2 inches |
| Capacity & performance | |
| Age Range Description | Adult |
| Construction & materials | |
| Material | Polyvinyl Chloride (PVC) |
| Included components | |
| Unit Count | 1 |
| Number Of Packs | 1 |
| Included Components | Air Pump, Plug, Ruler Tape |
| Warranty & support | |
| Warranty Description | 1 year |
| Other details | |
| Number of Items | 1 |
| Part Number | SJ31 |
Closest rivals on specs
Gaiam Classic Balance Ball Chair with Base- Item Weight 15.21 vs 12.5 pounds (+22%)
ATIVAFIT Half Balance Ball Trainer- Item Weight 15.21 vs 10 pounds (+52%)
BABYGO Birthing Ball- Item Weight 15.21 vs 4.23 pounds (+260%)
Frequently asked questions
What's the weight capacity of the Yes4All SJ31?
It's rated to support up to 880 lbs.
Can it replace a full stability ball for seated core exercises?
Not really. It's a half-ball design meant for standing and floor moves like step-ups, planks and lunges rather than seated bouncing exercises.
Does the trainer need to be inflated?
Yes, it's a PVC air-filled dome, and the listing describes the setup as designed to make inflation straightforward.