Under Tack Show Video and Stride Length Data for Two-Year-Olds in Training

EQUIX advances the Two-Year-Old Sale selection process with this extraordinary video analysis. Each horse's Under Tack is available in a slow motion format giving you a detailed view of Stride Quality, Efficiency, and other key variables that are performance predictors in two-year-olds.

Please SIGN UP above to view our COMPLIMENTARY Under Tack Videos and to check out our Stride Data pricing for each Sale.

What is a ProStride Qualifier?

EQUIX calculates the Average Stride Length and clocks the Gallop-Out times for each horse. Based on the horse’s Average Stride Length and official Under Tack Time, the horses are mathematically Ranked and sorted by Quartile for each show.

Horses that rank in the First and Second Quartile show greater Stakes Winning potential, based on our research since ProStride™ was launched ten years ago.

78% of SWs and 84% of GSWs sold at the juvenile sales have First or Second Quartile Under Tack data.

Our EQUIX ProStride™ video technology will help you select 2YOs whose stride length and efficiency reveal stakes-winning potential. Some of our 2025 stakes-winning ProStride™ data qualifiers include GSWs: Bear River, Booth, Cabo Spirit, Caitlinhergrtness, Cavalieri, Chancer McPatrick, Dream On, Durante, El Potente, Fast Market, Gaming, Governor Sam, Gun Song, Innovative, Irish Maxima, Italian Soiree, May Day Ready, Maysam, Mystic Lake, Nysos, Praying, Pilot Commander, Raging Torrent, Ready for Candy, Shisospicy, Skippylongstocking, Speed King, Taking Candy, Tenma, Usha, Velocity, Vixen, Warming and others. Click on our Stakes Gallery to view recent stakes winners.

Stakes-winning 2yos in 2025 include: Argos, Brant, Bottas, Cy Fair, Desert Gate, Ewing, Explora, Further Ado, Ground Support, Himika, Intrepido, Iron Orchard, Kingsolver, La Ville Lumiere, Revera, Ritzaphena, Sassy C W, Solitude Dude, Throckmorton, Trendsetter, and Yaupon de Replay.

Other ProStride™ standouts include Grade 1 SWs: Adare Manor, Arabian Knight, Arabian Lion, Café Pharoah, Carson’s Run, Cogburn, Colonel Liam, Country Grammer, Du Jour, Eda, Faiza, Gamine, Instilled Regard, Iscreamuscream, Kingsbarns, Knicks Go, Mage, Midnight Bisou, Mitole, Mixto, Muth, Practical Move, Saudi Crown, Speed Boat Beach, Taiba, Varda, War Like Goddess, Win for the Money, and Yaupon.



Thank You For Your ProStride Business!

Raging TorrentNysos

SkippylongstockingTenma

Current Sale VideosFree

  • Slow Motion
    Under Tack Videos of horses in current sale

Per Hip$30

  • Under Tack Show Data on Per Horse Basis
  • Your Selection
  • Avg Stride Length
  • Gallop-Out Times
  • Stride Rank by Quartile








Recent January ProStride Qualifiers
So Happy won G2 San Vicente S. at SA
Margarita Girl won G3 Las Flores S. at SA
Dazzling Dame won Busanda S. at Aqu
Hometown Bound won Turfway Prevue S. at TP
Explora won Santa Ynez S. at SA
Recent December EQUIX ProStride Qualifiers!
Usha won G1 La Brea S. at SA
Nysos won G2 Laffit Pincay, Jr. S. at SA
Skippylongstocking won G3 Harlan’s Holiday S. at GP
Cabo Spirit won G3 San Gabriel S. at SA
Haqeet won King Saud Bin Abdulaziz Cup at KSA
Caitlinhergrtness won My Charmer S. at TP
Counting Stars won Year’s End S. at OP
Doc Sullivan won Alex M. Robb S. at Aqu
Ms. Bucchero won Sugar Swirl S. at GP
La Ville Lumiere won Blue Norther S. at SA
Complexity Jane won Carousel S. at Lrl
Roll On Big Joe won Ring the Belle S. at OP
Destino d’Oro won Tropical Park Oaks at GP
Counting Stars won Astral Spa Overnight S. at OP
Rising Inflation won LA Champions Day Ladies Turf S. at FG
Sunday Boy won NY Stallion Series S. at Aqu.
Solitude Dude won Inaugural S. at Tam
Recent November EQUIX ProStride Qualifiers!
Nysos won G1 Breeders’ Cup Dirt Mile at Dmr
Shisospicy won G1 Breeders’ Cup Turf Sprint at Dmr
Further Ado won G2 Kentucky Jockey Club S. at CD
Fast Market won G3 Pebbles S. at Aqu
Moonlight won Cherokee Mile S. at CD
Dresden Row won G3 Autumn S. at WO
Sultana won G3 Maple Leaf S. at WO
Roll On Big Joe won Bet on Sunshine S. at CD
Deep Learning won Chelsey Flower S. at Aqu
Throckmorton won Awad S. at Aqu
Complexity Jane won Thirty Eight Go Go S. at Lrl
She’s Country won Key Cents S. at Aqu
Revera won Desi Arnaz S. at Dmr
Rising Inflation won John Valene Memorial S. at FG
Doc Sullivan won NY Stallion Series S. at Aqu
Lookinforbargains won Zia Park Distaff S. at Zia
Alani won Cornucopia S. at Prx
Recent October EQUIX ProStride Qualifiers!
Cy Fair won G1 Breeders’ Cup Juvenile Turf Sprint at Dmr
Iron Orchard won G1 Frizette S. at BAQ
Intrepido won G1 American Pharoah S. at SA
Ready for Candy won G2 Sands Point S. at BAQ
Bottas won G2 Pilgrim S. at BAQ
Explora won G2 Oak Leaf S. at SA
Praying won G2 Thoroughbred Club of American S. at Kee
Ground Support won G2 Miss Grillo S. at BAQ
Warming won G3 Autumn Miss S. at SA
Conducted won Thoroughbred Aftercare Alliance S. at Dmr
Bank Frenzy won Empire Classic S. at BAQ
Crown the Buckeye won Best of Ohio Juvenile S. at MVR
Cy Fair won Algonquin S. at WO
Dazzling Dame won White Clay Creek S. at Del
Himika won Anoakia S. at SA
Khozalite won Florida Sire Affirmed S. at GP
Had to Have Him won Maryland Million Turf Sprint S. at Lrl




Recent September EQUIX ProStride Qualifiers!
Brant won G1 Del Mar Futurity at Dmr
Argos won G1 Summer S. at WO
Shisospicy won G2 AGS Music City S. at KD
Mad House won G2 Gallant Bob S. at Prx
Gun Song won G2 Beldame S. at BAQ
Cavalieri won G2 Zenyatta S. at SA
Innovative won G3 John C. Harris S. at SA
Ready for Candy won G3 Winter Memories S. at BAQ
As Catch Can won Old Dominion Oaks at Cnl
Mystic Lake won Liberty Bell S. at Prx
Sweet Montreal won Joseph A. Gimma S. at BAQ
Buccherino won Parx Sprint S. at Prx
Doncho won Da Hoss S. at Cnl
Yaupon de Replay won Blenheim S. at FAH
Nothing Like You won Dark Mirage S. at LRC
Had to Have Him won Laurel Dash S. at Lrl
Dripping Gold won Presious Passion S. at Mth
Generous Lover won Michael G. Mackey Mem. Angenora S. at Tdn
Recent August EQUIX ProStride Qualifiers!
Velocity won G1 Del Mar Oaks S. at Dmr
Mansetti won King’s Plate S. at WO
May Day Ready won G2 Lake Placid S. at Sar
Ewing won G2 Saratoga Special S. at Sar
Bear River won G2 Mint KY Turf Sprint S. at KD
Praying won G3 Prioress S. at Sar
Himika won G3 Sorrento S. at Dmr
Desert Gate won G3 Best Pal S. at Dmr
Destino d’Oro won G3 Pucker Up S. at Elp
Swift Delivery won G3 Seagram Cup S. at WO
Iron Orchard won Seeking the Ante S. at Sar
Mystic Lake won Misty Bennett Pink Ribbon S. at CT
Tomasello won KD Preview Nashville Derby S. at Elp
Highway Robber won KD Preview Turf Cup S. at Elp
Bear River won KD Preview Turf Sprint S. at Elp
Ritzaphena won Prairie Meadows Debutante S. at Prm
Dazzling Dame won Sorority S. at Mth
Vincey Girl won Sheer Drama H. at GP
Trendsetter won Hickory Tree S. at Cnl
Reputation won Tyson Gilpin S. at Cnl
Diciassette won Proud Man S. at GP
Grounded won Avery Whisman S. at Pid
Crown the Buckeye won Best of Ohio Cleveland
Kindergarten S. at Tdn
Buccherino won State Representative’s Sprint S. at Prx
Run Away Rojo won Bucchero H. at Ind
Rising Inflation won Louisiana Cup Distaff S. at LaD
Good and Stout won Louisiana Cup Turf Classic at LaD