Learning trot - buy a copy of the British Horse Society manual ISBN O-872119-33-6 Go to page 31.
Instructions: 1 Find experienced, rythmic, steady horse. Nothing fast skittish, flirty or fancy. A nice broad flat back is admirable. Cobs are great.
Adjust stirrup leathers to allow ball of foot to rest with toes pointing up at 45 deg angle
Squeeze horse into slow trot
Sense rythm of horse's 2 beat movement (up/down up/down). Don't allow horse to speed up, keep pace slow and gentle
Rise slightly and in tune with the beat, off knee tucked into knee roll and ball of foot resting on bar of stirrup iron. Sense the upward pressure from the horse.
Don't rise too high. Take care to be in perfect upright balance.
Incline body very very slightly fowards from pelvis to absorb forward speed.
When dropping back down into saddle take care to land softly on saddle.
Keep up and down motion fluid - no hesitations.
Keep very loose contact with horses mouth thru reins to the bit - horses head will move only slightly at the trot. Take care not to jolt bit in the horse's mouth.
Hands and arms must be kept still despite motion of horse,
Keep head up and still, face direction of horse's movement
At beginning ride horse on lunge line with friend keeping the horse at steady, slowish, speed from the centre of the circle.
Rest and revert to walk on regular basis. When resuming trot, Rise to trot with squeeze of heel against horse's flank. At same instant call out to horse: "TROT ON"
Practice, practice, practice, go round and round in circles.
PS It will help to take Pilates lessons to strengthen stomach & back muscles. The under thigh muscles will take time to develop.
At first you may get lower back ache and even stomach muscle ache.
Always practice on flat level grassy or sandy surface of a fenced arena - no hills nor slopes.
The better you get, the easier it will become.