La Vita Weaver is the founder of Fit for God Ministries and the author of Fit for God: The 8-Week Plan That Kicks the Devil OUT and Invites Health and Healing IN. She says her belief in God helped her reduce from 200 pounds. She is based in Capital Heights, Md.

David M. O’Leary is a Jesuit priest and a senior lecturer in comparative religions and medical ethics at Tufts University in Medford, Mass. He contributed articles on heaven and hell to The Encyclopedia of Religious and Spiritual Development.

John Byl is co-author of Christian Paths to Health and Wellness (2007). He is a professor of physical education at Redeemer University College in Ancaster, Ontario, Canada. He can discuss the biblical foundation behind the Christian fitness movement.

The Rev. Maria Erling is a Lutheran pastor and an associate professor of the history of Christianity and global missions at the Lutheran Theological Seminary at Gettysburg in Gettysburg, Pa. She contributed a chapter on mainline Protestants in New England to Religion and Public Life in New England: Steady Habits Changing Slowly.

Daniel Terris is director of the International Center for Ethics, Justice and Public Life at Brandeis University in Waltham, Mass. He contributed a chapter on Jews and African-Americans in the New England states to Religion and Public Life in New England: Steady Habits Changing Slowly.

J. Ron Eaker is a doctor and the author of Fat Proof Your Family: God’s Way to Forming Healthy Habits for Life (2007). He blogs at Fat Proof Your Family and can discuss women and fitness from a Christian perspective. He lives in Augusta, Ga.

David Hackett is an associate professor of religion at the University of Florida in Gainesville. He is an expert on American religious history and the sociology of religion.  

Susan Bordenkircher is the author of Yoga for Christians, which is based on a class she developed called “Outstretched in Worship,” a Christian approach to yoga. She is based in Fairhope, Ala.

The Rev. Paul Barton teaches Hispanic church studies at Episcopal Theological Seminary of the Southwest in Austin, Texas. His expertise includes U.S. Hispanic Christianity, especially U.S. Hispanic Protestantism. His books include Hispanic Methodists, Presbyterians and Baptists in Texas (2006).