OA, Running (1, 16 a): The barbarian can move at 2wice his normal movement rate for an entire day, at the end of which he must sleep for eight hours.
After the end of the first day's movement, the character must make a die roll for success.
If the die roll is passed, the character can continue his running movement the next day.
If the die roll is failure, the character must sleep for eight hours and cannot use his running ability the next day.
If involved in a combat during the day spent running, he suffers a -1 on his to hit rolls.

a This skill req. a die roll to determine success.
 

WSG, Running (2, CON, 0): This skill takes two forms: sprinting && distance running.
Either skill can be employed separately, but both
cannot be used at the same time.
Skill in running is most often found in characters who were raised || have spent a considerable
amount of time in a high-altitude environment, although
other characters are capable of training themselves to acquire
these skills.

Sprinting is the ability to MOVE at high SPEED on foot for a
    relatively short period of time. A proficient character who is
    not encumbered and is not wearing armor heavier than
    leather can run at twice his normal max. movement
    rate for five rounds, or one and one-half times as FAST as
    normal (round up to the nearest whole number) for one
    TURN, whichever is chosen by the character. Extended
    sprinting is possible if the character makes a series of Skill
    Checks, one per round beginning when the above-mentioned
    time limit expires. Each Skill Check after
    the first one is made with a cumulative modifier of +3 to the
    die roll (+3 on round two, +6 on round three, etc.). Each
    successful Skill Check indicates that the character
    can keep sprinting for another round. One failed Skill
    Check indicates that the character has become fatigued.
    He can continue to sprint, but he runs the risk of
    becoming exhausted if he fails another Skill Check.
        A character can choose to stop sprinting at any time. If
    he is fatigued when he stops, he will remain fatigued and is
    still subject to becoming exhausted if he performs any
    other strenuous activity. If he becomes exhaustd, he must
    stop sprinting immediately and will remain exhausted until
    he has recovered. If a character stops sprinting before
    becoming fatigued, he can continue to MOVE at his normal
    max. rate for two<2> turns and then begin sprinting again.
    If he slows to one-half his normal max. rate, he can begin
    sprinting again in one TURN.

Distance running is the ability to MOVE at normal running
    SPEED for longer than a normal character can, without risking
    adverse effects. For the purpose of the rules governing
    Fatigue && Exhaustion, running is not considered a particularly
    strenuous activity for a character with this proficiency.
    All the time limits given for the fatigue rules in the
    section on Fatigue && Exhaustion are either doubled or
    halved (in favor of the character) for a character with running
    proficiency who is engaging in a long-distance run.
        For instance: A character with running proficiency can
       avoid the effects of fatigue by resting for one turn after exerting
        himself for eight turns. If a character spends twelve
        turns in long-distance running (without one turn of REST), the
        player must make a CON Check. If that check is
        successful and he continues to run for ten more turns, another
        check is required, and so on.

        This alteration of the time requirements does not apply if
    the character becomes fatigued or exhausted. Also the
    benefits of this aspect of the running proficiency are negated
    if the character stops in the middle of a long-distance
    run to engage in any other type of strenuous activity (such
    as fighting or climbing). In such a case, the character must
    immed. begin to abide by the standard rules governing
    fatigue && exhaustion, as if he had just begun to perform
    strenuous activity.