Assess ability to apply the FITT principle (Frequency, Intensity, Time, Type) to design a safe, progressive 6-week exercise program to improve cardiovascular fitness in adults. Learners should specify weekly frequency, target intensity (heart rate zones or RPE), session duration and activity types, a clear progression plan, safety/modification strategies for common limitations, and objective measures for monitoring and evaluation. Include brief justifications and measurable goals for given client scenarios (e.g., sedentary, moderately active).