In the extended trot, the horse covers as much ground as possible. Maintaining the same cadence, with impulsion from the hindquarters, he lengthens his steps to the utmost. To get the most ground coverage and length from the frame, the rider allows the horse to remain on the bit without leaning on it.
In a proper extended trot, the front hooves touch the ground in the direction they are pointing; and the forward movement of the fore and hind legs are parallel while in extension. With well-balanced movement, the transition from the extended trot to collected trot is smooth with the horse taking more weight on the hindquarters.
Shown here is Sven Rothenberger on the stallion, Jonggor's Weyden (by Western Star, out of Grandia by Grande).