Upper level horses have lots of buttons. Depending on the way I use my leg and at which point in the stride and how my seat is I may be asking for a quicker hind leg, more cadence, more extension, more collection, or a complete gait change.
The timing of your aids is immensely important. Generally a slow leg at the top of the stride is asking for more cadence from the horse, or leads into a passage. Try using a very quick leg (think 15 aids per second) and when the horse has one diagonal pair on the ground. Also use your back to ride every stride quicker, ie when a DP has landed, already be pushing with your back for the apex of the stride.
Same thing in the canter. And take your leg off. If he trots same thing - 15 kicks per second, and if needed a tap.
Upper level horses do not like whips. Mine is extremely offended by them. Use your back, use your core and have very good timing with your legs and the horse will become hot.
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