Following are a number of back-translations as well as a sample translation for translators of Isaiah 40:29:

• Kupsabiny: “He strengthens the weak
  he helps those who have no power.” (Source: Kupsabiny Back Translation)
• Newari: “To the ones who have been becoming tired
  and to the ones who have no strength he gives strength.” (Source: Newari Back Translation)
• Hiligaynon: “He gives strength to the weak ones and the ones who get-tired.” (Source: Hiligaynon Back Translation)