We travel much, yet prisoners are, and close confined to boot. Yet with any horse, we will keep the pace, and will always go on foot. What are they?

Common Wrong Answers
“Horses”
Horses can travel far and are often associated with riding, but they are not confined or prisoners; they are animals that can roam freely.
“Saddles”
Saddles are used for riding horses and do not travel on their own; they are not confined or restricted in the same way the riddle suggests.
“Wheels”
Wheels can travel and are often associated with vehicles, but they do not have the characteristics of being prisoners or confined, nor do they 'go on foot'.
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