[math-fun] L versus 2L

Is there a words that means the operation of taking a pair of steps (one with the left foot and one with the right), or the distance travelled during such an operation? I had hoped that the term "stride" meant this. And indeed, according to at least one website, the stride of a horse is defined as the distance the horse has advanced when each of its legs has returned to its initial position (that is, the distance the horse travels during a full period). But that same site says that a person's stride is defined as the distance the person travels when taking a single step (that is, the distance the person travels during a half-period). For that matter, is a "lap" equal to one pool-length, or two? Jim