Secretariat's Big Stride Angle

There's a lot of debate about what makes for a fast thoroughbred. Is it breeding? Heart? Training? Or a good jockey?

Stride Angle

The stride angle is the maximum opening between the front and rear legs, usually occurring at push off from the rear foot. We have found that for every degree you increase the stride angle, you increase the stride length by 2%. This means that if you increase the stride angle just 10°, you will cover 20% more ground with each stride.

It's very difficult to catch up with someone who is covering 20% more ground than you are with each stride. In five strides, he or she will be a full stride length ahead of you. In twenty strides, they will be four stride lengths ahead of you.


When we learned that Secretariat won the Belmont Stakes in 1973 by 31 lengths and ran the fastest 1 1/2 miles on dirt in history (2:24 flat), we were intrigued. The conventional explanation for Secretariat's success was that on autopsy his heart was found to be three times the normal size for his breed. But we have found that the 'conventional explanation' for athletic success is always based on strength and endurance, and never on stride efficiency. So we searched for some photos of Secretariat's stride angle, and we found that it was 110°.


Barbaro won the 2006 Kentucky Derby by 6 ½ lengths, but suffered a fatal injury when he broke his right rear leg during the Preakness. Barbaro's stride angle was 105°.


Affirmed won the Triple Crown in 1978 (the last horse to do so) with a 93° stride angle.


Forego is listed as #8 in the top 100 racehorses of the 20th century, with a 90° stride angle.

Man O'War

Over his two-year career, Man o' War won 20 of 21 races, setting three world records, two American records and three track records. Although he was ranked by some as the best thoroughbred of the 20th century, his times were slower than Secretariat's. We suspect that his competition in the early part of that century was not as good as Secretariat's in the 1970's. His stride angle was 88°.

Distance          Man O'War           Secretariat 

6 furlongs         1:11 1/5                  1:09 4/5 
1 mile                1:35 4/5                  1:33 2/5 
1 1/16                1:44 4/5                  1:42 4/5 
1 1/8                  1:49 1/5                  1:45 2/5 
1 3/16                1:56 3/5                  1:53 2/5 
1 ¼                  2:01 4/5                  1:59 flat 
1 3/8                  2:14 1/5                  2:12 1/5 
1 1/2                  2:28 4/5                  2:24 flat 
1 5/8                  2:40 4/5                  2:37 4/5 

Seattle Slew

Seattle Slew won the Triple Crown in 1977 with a stride angle of 83°.

What determines the stride angle?

It is plain to see that Secretariat had the biggest stride angle of any thoroughbred, which is why he has such a legendary position in horse racing. He was able to cover more ground than his opponents, which led to his stunning victories and phenomenal speed.

The stride angle is a result of the amount of microfibers (scar tissue) in the connective tissue surrounding the muscles of the legs.

Each muscle is surrounded by a thin membrane of connective tissue. Inside the body, the muscles never touch each other. Instead, the membrane of one muscle slides along the membrane of the adjacent muscle. The role of the connective tissue is to facilitate this sliding, which has to take place in order for the muscles to stretch.

The connective tissue between the muscles (fascia) serves the same purpose as cartilage does in a joint. In a joint, adjacent bones never touch each other. The end of each bone is covered with cartilage (another form of connective tissue), which provides a smooth, slippery surface to facilitate the movement of the bones.

In the same way, the connective tissue between the muscles facilitates movement.

Microfibers (a mild form of scar tissue) form in the connective tissue between the muscles to immobilize the area so that it can heal after injury, overuse or stress. These microfibers are nature's internal cast. They cannot be released by stretching. Once the injury, overuse or stress has passed, the microfibers not only do not go away, they tend to accumulate over time, which is why a horse slows with age.

Normally, the connective tissue membranes (white) between the muscles (red) are smooth. They allow the muscles to slide past each other, which they have to do in order to stretch.

But when you have even a mild injury (falls on court), overuse (lifting weights, running) or stress , microfibers form as part of the healing process to immobilize the area. Microfibers are nature's internal cast.

Unfortunately, once the area has healed, the microfibers not only do not go away, they tend to accumulate over time, making athletes stiffer with age.

Releasing Microfibers

Somax releases microfibers with its special program of Microfiber Reduction. The results can be seen in these photos of a runner. By increasing his stride angle from 95° to 125° (an increase of 30°), he is covering 60% more ground with each stride. We did this by releasing microfibers that were binding his muscles together. Our runners usually cut a minute per mile off their running pace.

Before Microfiber Reduction                              After Microfiber Reduction

Is 110° the limit?

We were surprised to see that Secretariat, the horse with the biggest stride angle, was only able to open his legs 110°. The cheetah, which has a top speed of 70 mph, has a stride angle of 125° or more. Secretariat was only able to reach a top speed of 49 mph with his 110° stride angle.

It is intriguing to think what Secretariat, or any other horse, could do with a stride angle larger than 110°.


Horse owners should look beyond the conventional approaches of breeding, training and jockey selection to improve racing speed, and think instead about improving stride efficiency.

For every degree you increase the stride angle of a horse, you increase it's stride length by 2%. Just a 10° increase in stride angle means the horse will cover 20% more ground with each stride. An increase in stride angle of 10-20° is easily achievable with Microfiber Reduction.

Historically, the fastest horse in history had the biggest stride angle of all those measured.