The Alter of Marinover shlita (Sefer Ish Echod) would say: “'ויאמר עבד אברהם אנכי' - As long as Avraham Avinu still needed to find a wife for his son, Yitzchok, Eliezer is referred to as an ‘Eved’; he still had a mission to complete. However, once he found Rivkah, his mission was complete and he can now be called an ‘ish.’ Later, though, Eliezer is referred to again as eved, because he was on a new mission from Besuel and Lavan, to bring Rivkah back to Yitzchok. As Yidden, we are referred to as Avdei Hashem, because our whole life we are on a mission from Hashem to bring out Kvod Shamayim, and be Mekadesh Shem Shomaim.”
A Wise Man would say: “Whenever I feel the need to exercise, I lie down until it goes away.”