Horses don’t have to be ridden if they have enough turnout space and time to move around. If a horse is being ridden and doing more than light work then they should be ridden a minimum of 3-4 times a week. A horse being ridden only 1 or 2 times a week at a higher workload than what’s considered light work puts the horse at risk of injury because they won’t have the fitness level for that kind of work. Horses can be ridden every day as long as a day or two is lighter work.