"Horse slimnastics" generally refers to exercises that increase a horse's agility and flexibility. Here are some synonyms that can be used in place of "horse slimnastics":
1. Horse gymnastics
2. Equine fitness training
3. Horse conditioning exercises
4. Horse stretching routines
5. Equine performance workouts
6. Horse mobility drills
7. Horse athletic exercises
8. Horse agility training
9. Horse aerobics
10. Horse movement routines
No matter what term is used, these exercises are beneficial for improving a horse's overall health and wellbeing, as well as enhancing their athletic capabilities. Whether a horse is a high-performance athlete or a beloved companion, incorporating some form of horse slimnastics into their routine can be a great way to keep them happy and healthy.