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A strong core and a trained cardiovascular system make us more resistant to fatigue, feeling more capable in our own body and, generally, more physically powerful. The Cardio and Core Challenge helps you get through a 30-day long fitness regime that will help your core become stronger and your cardiovascular fitness improve. Combine this challenge with stretching or flexibility workouts and you have a complete fitness training program that, by the end of the month, will transform your physical capabilities.