Natalia started an exercise program that includes stretching daily and yoga three times each week. what area of fitness is natalia targeting, and what is her potential for improvement in this area based on her fitness program? a. body composition; she is on track to significantly improve in this area based on this program b. cardiovascular endurance; she will never reach this goal unless she adds weightlifting to her routine c. flexibility; she is on track to significantly improve this area of fitness by sticking with this program d. muscular strength; she will only improve in this area if she adds cardio to her workout schedule