After George had a heart attack at age 40, he decided to change his lifestyle. Which form of physical activity would best help h
im improve the health of his heart? 1. swim for 20 minutes Tuesday and Friday; lift weights for 20 minutes Monday, Wednesday, and Saturday
2. swim for 20 minutes Tuesday and Friday; run or walk briskly for 30 minutes Sunday, Wednesday, and Saturday
3. ride an exercise bike for 20 minutes Tuesday and Friday; walk leisurely for 20 minutes Sunday, Monday, Wednesday, and Saturday
