TRX Stability Ball
- Item Diameter: 21.7 inches
- Size: 21.7 inches
- Material Type: Vinyl
- Item Weight: 2.2 pounds
Last refreshed Jul 5, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A durable stability ball that holds air well over time, but budget for your own pump since none is included.
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ASIN: B09G2RW324Category: Exercise Balls
Sizes Available
Need a different one? Pick on Amazon →
Overview
TRX sells this stability ball in 55cm and 65cm sizes matched to rider height, shipped deflated for at-home core and balance training.
- Two sizes: 55cm and 65cm
- Anti-slip vinyl construction
- Ships deflated for compact shipping
- Includes trial access to TRX Training Club app
Who it's for
Home gym users, physical therapy clients, and trainers who already own a pump and want a durable stability ball for core, balance, or rehab work will get good use here. Not a fit for anyone expecting an inflation pump included in the box.
Pros and cons
- Holds air without leaking over weeks of use
- Durable vinyl suited to regular strength work
- Sized by rider height for better fit
- No hand pump included
- Sizing may run larger than the labeled diameter
Performance notes
Sizing is meant to match rider height (55cm for 5'1 to 5'8, 65cm for 5'8 to 6'1), though at least one buyer felt their ball measured closer to 65cm than labeled. Inflation is done with a standard air pump, not an included accessory, despite instructions cautioning against it.
Specifications
| Brand | TRX |
|---|---|
| Dimensions & fit | |
| Item Diameter | 21.7 incheshigher than 65% of 49 exercise balls |
| Size | 21.7 incheshigher than 55% of 34 exercise balls |
| Item Weight | 2.2 poundshigher than 62% of 38 exercise balls |
| Capacity & performance | |
| Age Range Description | Adult |
| Construction & materials | |
| Material Type | Vinyl |
| Color | Black |
| Included components | |
| Unit Count | 1 |
| Other details | |
| Number of Items | 1 |
Closest rivals on specs
Fitvids Anti-Burst Exercise Ball with Quick Pump- Item Weight 2.2 vs 2 pounds (+10%)
- Size 21.7 vs 19 inches (+14%)
ProBody Pilates Exercise Ball- Item Diameter 21.7 vs 25.6 inches (-15%)
Frequently asked questions
Which size should I choose?
TRX sizes the 55cm ball for heights 5'1 to 5'8 and the 65cm ball for 5'8 to 6'1.