Darby(i)
29 He giveth power to the faint; and to him that hath no might he increaseth strength.
30 Even the youths shall faint and shall tire, and the young men shall stumble and fall;
31 but they that wait upon Jehovah shall renew [their] strength: they shall mount up with wings as eagles; they shall run, and not tire; they shall walk, and not faint.