Do you have ideas of workouts to really help a horse to maintain the strength in all of her muscles, and also, what is the best exercise to help loosen all of her muscles?

Lots of stretchy work where she's lengthening over the top line and bending excercises will help to supple her up. Hill work and trot/canter poles are awesome for making the horse really work and build a lot of muscle. If you have access to a pool or aqua trainer, working them in water is also a great option. I'm also a fan of short gallop sets with lots of trot work in between.
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