Carl wants to improve his physical appearance without changing his weight. He has no restrictions as long as he uses his albuterol inhaler. The exercise prescription includes cardiovascular activity like walking and running 3-5 days a week for 30 minutes, strength training 2-3 days a week doing 3 sets of 15 reps of exercises at over 50% heart rate, and flexibility training 3-5 days a week stretching for 30-60 seconds per stretch. The FITT and PROS principles provide guidelines on progression, regularity, overload, and specificity for each type of exercise.