Longtime humanitarian Rosalie Fredericks, known for her devotion to the Society for the Prevention of Cruelty to Animals, has bowed out of the Spring Hill Fire and Rescue District Commission race. Citing health problems and an inability to drive herself to night meetings, Fredericks, 79, said Friday that, if elected, she wouldn't be able to serve. "I'm too old," she said. "I have bronchial asthma. . . . If I went in, I would give it all I have, and that was too much." Retired Air Force Lt. Colonel Donald Knutson, 68, and Richard Martin, 31, a territory manager for Pro Equipment, which deals in outdoor power equipment, remain in the race for three open seats. The non-partisan, at-large seats at stake are those occupied by Eugene Wright, Al Kroner and Dennis Andrews. Winners will be the top three vote-getters.