Sofia emphasizes aerobic, core, and strength training in her fitness program. She takes a break from her program when her family goes on a visit to Mexico for a month. When she returns to her program, she feels as though she is starting over from the beginning. What did Sofia MOST likely need to do? A. Focus on balance and flexibility training in her program. B. Find a way to continue her program in Mexico. C. Overload her fitness activities more. D. Plan for a slower progression.