Whats her secret?

The strongman at a circus squeezed the juice from a lemon between his hands. He then said to the audience, "I will offer $200 to anyone in the audience who can squeeze another drop from this lemon. A thin scholarly looking woman came forward, picked up the lemon, strained hard and managed to get a drop. The strongman was amazed. He paid the woman and asked, "What is the secret of your strength?" "Practice," the woman answered. "I was the treasurer of a Lutheran Church for thirty-two years!