Which of the following is the best example of a SMART goal for improving cardiovascular fitness?

• A. I'll start jogging more often to improve my heart health.
• B. I will complete a 5-kilometer run in under 30 minutes within 12 weeks by training three times per week.
• C. I want to have better endurance this year.
• D. I plan to run faster so I can feel healthier soon.

Answer: (B)