Acronym |
Definition |
| 10YTC | 10 Year Trail shared stewardship Challenge |
| AARG | Arizona Adventure Riding Group |
| AARP | Aged Adults Riding Proud |
| ABB | American Bucking Bull |
| ABRS | Authority of British Riding Schools |
| ACTRA | Atlantic Canada Trail Riding Association |
| ADA | Alamo Dressage Association |
| Air Force | As In Reality, Forcing Ourselves into Riding Chairs Eternally |
| AIRC | Association of Irish Riding Clubs |
| AIRE | Association of Irish Riding Establishments |
| AJC | Australian Jockey Club |
| ALRC | Alta Loma Riding Club |
| ANRC | American National Riding Commission |
| AOER | Archers of East Riding |
| APRA | American Professional Rodeo Association |
| ARAS | Advanced Riding Assistance System |
| ASB | American Saddle Bred |
| ASHA | American Saddlebred Horse Association |
| AT | American Trails |
| ATHRA | Australian Trail Horse Riders Association |
| ATRC | American Therapeutic Riding Center |
| ATRO | Acadiana Therapeutic Riding Organization |
| AWARE | Always Wanted A Riding Experience |
| BB | BareBack (horse riding) |
| BCHBC | Back Country Horsemen of British Columbia (Canada) |
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