Isaiah 40:31

 31 But they that ^await upon the Lord shall ^brenew their ^cstrength; they shall mount up with wings as ^deagles; they shall ^erun, and not be weary; and they shall walk, and not faint.

Kenny James:

One, there is a literal interpretation of this scripture: Those that trust in the Lord, and live by that trust, will one day live with Him in heaven. We will have eternal bodies that do not tire, and will never grow faint.

Two, one can also look at it as one another gracious blessing for our earthly existence. If one trusts in the lord, blessings can follow. Their strength will be renewed, or strengthened.

Amanda Brock: 

I agree with Kenny, if we trust on our Heavenly Father than we will be strengthened to get through all of the things in this world. We will have the strength to not only endure trials but also to do many things of service and even things of joy. Heavenly Father will always want the best for us because he loves us. If we show our love to Him, then he will do the same.