Mary wants to improve her fitness enough to run a 10K race. Which is probably the best exercise program for her to maintain her fitness?
A. Run 4 to 5 times per week for 30 to 40 minutes at a time.
B. Run 10 40-yard sprints with a short rest in-between.
C. Walk 20 minutes per day and lift weights to improve leg strength.
D. Walk 45 minutes per day.
Answer: A
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