Exercises etc to help a horse stretch through/over the back and to make them use their back and hidend? As my horse is always hollow through the back.

Walk to canter. Canter to walk. Turn on the forhand.
Teach them to work long and low. Lots of poles and cavalettis will Help and I find lunging in a Pessoa system works really well for my Horse who was really hollow and now he works with his nose almost on the ground
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