Begin by collected collected troting your horse at a brisk pace. When you're both moving well, cluck and collected trot.
Your horse should immediately match your pace and collected trot beside you at the shoulder position.
Maintain the collected trot for 20-30 steps, then return to collected collected trot with a 'whoa' and slowing your feet.
The transition from collected collected trot to collected trot should be prompt — within 2 steps of your cluck.
The transition from collected trot to collected collected trot should also be prompt — the horse shouldn't collected trot past you.
Practice 8-10 collected collected trot-collected trot-collected collected trot transitions. The horse should become more responsive each time.
Common Mistakes to Avoid
Running out of breath because you're not fit enough to jog with the horse.
The horse pulling ahead at the trot because it has more energy than you.
Not establishing clear difference between your walk and trot cues.
Letting the horse break to canter when you only asked for trot.
Variations & Progressions
Add halt from the trot for a more advanced transition.
Practice trotting in-hand over ground poles for coordination.
Lead at the trot in-hand as part of your warm-up routine before every ride.
Tip: In-hand trotting is a great fitness check for you too. If you can't jog with your horse for 2 minutes, consider adding some running to your own fitness plan.