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Once your horse is toned up from the Winter softies, you can begin this regiment of Cardio & Muscle Development Program.
Begin on Trails, (hopefully ones that have hills and flat)!
Walk 10 minutes, trot 10 minutes, walk 10 minutes, canter 10 minutes, walk 10 minutes, trot 10 minutes, walk 10 minutes, canter 10 minutes, walk 10 minutes.
I think you can see the pattern established here. By alternating the three gaits, you are alternating muscle groups, as well as bringing them up, then down, then alternating up, then down. This is what is happening to the Cardio system as well.....trot and canter both work the cardio system completely differently.