What do horses that are frequently exercised need?

Answer 1

Horses that are frequently exercised need increased protein and increased carbohydrates.

Horses that have heavier work will also benefit from rubdowns with a diluted liniment or brace. This will help sore or strained muscles relax and most horses love the extra pampering. It is always a good idea to wrap the horse's legs or put on protective boots (splint, skid, hock, bell) to reduce chance of injury during workout.

Horses need high quality forage (hay or grazing), high-energy/protein (grain), water, salt, trace minerals. Proportions will vary according to type & frequency of exercise, age of horse, and other factors.
Well, typically a horse with a larger amount of exercise would get an increase in their concertrates.

Well, typically a horse with a larger amount of exercise would get an increase in their concertrates.

Answer 2

Typically horses that are frequently exercised need an increase in calories and protein in their feeds, along with more pounds of food per their bodyweight.Also they may need more intensive farrier care and veterinarian care depending on their level of wear and tear.