Mark Sickmiller, pastor of Northside Baptist Church, Calera, has discovered a surefire 24-day weight loss plan: Ride a bicycle for 2,578 miles. The now extra-lean Sickmiller knows from personal experience, even though the event now seems a bit surreal. “I did it and I can’t imagine that I did it,” said the 38-year-old Michigan native, shaking his head in disbelief.…