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Developer's DescriptionBy Flawless ComplexionLose your weight or increase muscle size with variety of circuits.Get in shape fast with professional circuit training software: Fit Kit. Whether you need to lose weight or to increase muscle size fast, Fit Kit can help. Fit Kit is professional circuit training software with a variety of circuits built in to the software and new circuits being made available regularly as well as an ever growing list of exercises each with detailed instructions.