Stephanie has been preparing for a marathon with a rigorous workout routine. Today, she completed a series of exercises involving short sprints at her maximum speed followed by brief periods of light jogging. Which type of fitness program is Stephanie most likely implementing?

Stephanie alternates short, maximum-speed sprints with brief periods of light jogging. A workout that switches between intense effort and recovery periods is interval training, so the correct choice is interval training. Circuit training rotates through different exercises, while strength training focuses on building muscle and cross-training combines different types of activities.

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