The many lives of Arnold Schwarzenegger get neatly divided into three equal parts in “Arnold,” a Netflix documentary-cum-self-led tour through his remarkable success story as bodybuilder, actor and politician, each more improbable than the other. Now acting again (in a series for Netflix, conveniently), Schwarzenegger’s missteps aren’t ignored in the doc, but the emphasis is on how he pursued and achieved his goals, envisioning his stardom before making it a reality.
