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The course allows students to meet requirements by exercising how they want, when they want. They are required to work out hard for 30 minutes four times a week and report to their teachers by e-mail. Parents must certify that the students did the workouts.

Still, some committed online educators remain unconvinced. Tim Snyder, the executive director of Colorado Online Learning, which offers more than 50 online courses to Colorado schools, included physical education with studio art, marching band and the laboratory sciences as subjects best left to brick-and-mortar schools. "These are still better experienced in a hands-on setting," Dr. Snyder said. But online gym has prospered. That has been possible in part because physical education itself has evolved. Once a highly regimented class centered on team sports and competition, physical education now emphasizes healthy living and personal fitness, topics some see as eminently suited for independent Internet study.

Even the course's author, Brenda Corbin, who writes curriculums for the Minneapolis district, was dismissive at first. "I refused to be a part of it," Ms. Corbin said of her initial reaction a year ago, when Ms. Braaten and district administrators approached her about writing the physical education course. "How do you know they're really working out?" Ms. Corbin said she asked. But she later changed her mind. "I was uninformed about what you can do over the computer," she said.