Luke 2:37 And she was a widow of about fourscore and four years, which departed not from the temple, but served God with fastings and prayers night and day.
Anna was 84. No doubt, there wasn't a whole lot of physical activity she could do to serve the Lord. But in her advanced age, there was a great service she could yet do for the Lord…she could fast and pray around the house of the Lord.
Don't discount the ministry of prayer! It is the greatest resource of the believer. It is the great and mostly untapped power of the universe. Add fasting to the equation and it's power is increased exponentially.
So, when you feel you can't do much else, pray! Pray for open doors that the gospel might be preached. Pray for the pastor, the church and its family, the poor and needy, those in leadership, missionaries, the persecuted, and pray for our nation. Leaf through the newspaper and find those on every page in need of someone praying for them.
You are doing a great ministry when you pray!