Days of '76 Rodeo: Steer Wrestling

According to Wikipedia: The event features a steer and two mounted cowboys, along with a number of supporting characters. The steers are moved through narrow pathways leading to a chute with spring-loaded doors. A barrier rope is fastened around the steer's neck which is used to ensure that the steer gets a head start. The rope length is determined by arena length. On one side of the chute is the "hazer", whose job is to ride parallel with the steer once it begins running and ensure it runs in a straight line, on the other side of the chute the "steer wrestler" or "bulldogger" waits behind a taut rope fastened with an easily broken string which is fastened to the rope on the steer.

Steers typically weigh between 450 and 650 pounds

The preferred method of wrestlingthe steer to the ground is to lean from the galloping horse which is running beside the steer, transferring the weight of the upper body to the neck of the steer, 

 with one hand on the near horn of the steer and the far horn grasped in the crook of the other elbow.

One then lets the horse carry his feet by the steer until his feet naturally fall out of the stirrups. 

This wrestler could not get the steer to 'roll' correctly,

so he got up and started all over.

The steer wrestler then slides with his feet turned slightly to the left, twisting the head of the steer toward one by pushing down with the near hand and pulling up and in with the far elbow.

When done right, it looks like this...

All four feet in the air

Once all four legs are off the ground, an official waves a flag marking the official end and a time is taken. The steer is released and trots off.

Typical professional times will be in the range of 3.0 to 10 seconds from the gates opening to the waving of the flag.