Under Tack Show Videos 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.
| Raging Torrent | Nysos |
| Skippylongstocking | Tenma |
OBS June
$2800
To Order
$2800
- Under Tack Show Data for
Entire Sale - All Horses
Workout Times Given - Avg Stride Length
- Gallop-Out Times
- Stride Rank by Quartile
Per Hip$30
To Order- Under Tack Show Data on Per Horse Basis
- Your Selection
- Avg Stride Length
- Gallop-Out Times
- Stride Rank by Quartile
Recent June ProStride Qualifiers
Nysos won G1 Metropolitan H. at Sar
Counting Stars won G1 Acorn S. at Sar
Further Ado won G3 Matt Winn S. at CD
West End Kid won G3 Pennine Ridge S. at Sar
Goodall won Jersey Girl S. at Sar
Explora won Leslie’s Lady S. at CD
Doncho won Mighty Beau S. at CD
Recent May ProStride Qualifiers
Crude Velocity won G2 Pat Day Mile S. at CD
My Miss Mo won G2 Black-Eyed Susan S. at Lrl
Yellow Card won G2 Twin Spires Turf Sprint S. at CD
Irish Maxima won G2 Ruffian S. at BAQ
Forged Steel won G2 Hollywood Gold Cup S. at SA
Usha won G3 Winning Colors S. at CD
Durant won G3 John A. Nerud S. at BAQ
Reagan’s Flame won G3 Whimsical S. at WO
Warming won G3 Gallorette S. at Lrl
Desert Gate won Texas Derby at LS
Margie’s Intention won Allaire DuPont Distaff S. at Lrl
Bust Out won Cinema S. at SA
Turino won Monroe S. at GP
Recent April ProStride Qualifiers
Further Ado won G1 Blue Grass S. at Kee
So Happy won G1 Santa Anita Derby at SA
Cy Fair won G3 Mamzelle S. at CD
Trendsetter won G3 Lexington S. at Kee
Mad House won G3 Count Fleet Sprint H. at OP
Saudi Crown won G3 Commonwealth S. at Kee
Dragon Welds won Tokyo Sprint at Oi
Solitude Dude won Bay Shore S. at Aqu
Outlaw Kid won King T. Leatherbury S. at Lrl
Yo Daddy won Excelsior S. at Aqu
Tiz Mary’s Comet won Lafayette S. at Evd
Mony Mony won Star Shoot S. at WO
Arbiter won Woodstock S. at WO
Spring Dancer won Majestic Overnight S. at OP
Recent March ProStride Qualifiers
Counting Stars won G2 Fantasy S. at OP
Destino d’Oro won G2 Hillsborough S. at Tam
Nu What’s New won G3 Oaklawn Mile S. at OP
Sultana won G3 Orchid S. at GP
Skippylongstocking won G3 Essex H. at OP
Dandona won G3 Florida Oaks at Tam
Explora won G3 Honeybee S. at OP
Goodall won Purple Martin S. at OP
With the Angels won Correction S. at Aqu
Way to Be Marie won Tom Benson Memorial S. at FG
Nine Part won Costa Rising S. at FG
Desert Gate won Hot Springs S. at OP
Mr Mo’s Magic won Sophomore Turf S. at Tam
Recent February ProStride Qualifiers
El Potente won G3 Thunder Road S. at SA
Roll On Big Joe won King Cotton S. at OP
Light Won Up won Sweet Life S. at SA
Coco Connect won Valdale S. at TP
Mystic Lake won Minaret S. at Tam
Yellow Card won Clocker’s Corner S. at SA
Passage East won Barbara Fritchie S. at Lrl
Boss of All Bosses won Edward J. Johnson Memorial S. at FG
Recent January ProStride Qualifiers
Skippylongstocking won G1 Pegasus World Cup Inv. S.
at GP
Destino d’Oro won G2 Pegasus World Cup Filly and Mare
Turf Inv. S. at GP
So Happy won G2 San Vicente S. at SA
Mendelssohn Bay won G3 Firebreak S. at Mey
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
Solitude Dude won Swale S. at GP
Thousandsticks won Kitten’s Joy S. at GP