You can even offer the prayers of others as your own prayers. Saint John Vianney told a story of a man who became very holy from this:
“‘I did nothing * but say, Those who pray so devoutly are saints: I am their beast of burden: O Lord! I have the intention of doing what they do: I say to Thee whatever they say.’ These were afterwards his ordinary words, and he arrived by means of this at a sublime degree of prayer.”*