Horse biomechanics at trot
This is the frame we should search for in warming up, cooling down or relaxing phase of every horse training.
The horse on this picture moves with relaxed topline (back, neck, croupe), engaged core muscles (pink arrows), telescopes the neck forward down (violet arrow, small orange arrow), relaxes and opens pole area. Lifts energetically his legs (red arrows) and lowers a bit his croupe (big orange arrow). Because he engages his core and relaxes his topline, the back and neck base are lifted (green arrows). So the energy can come smoothly from behind and he swings in the movement.
The head is infront of the vertical, seeking the light contact of the longeline. The horse can see forward, but is still focused on me (see the inside ear). He looks relaxed and happy (bright eye).