Answer:
Step-by-step explanation:
The central idea in this paragraph is explicit because it is directly stated in the paragraph. The central idea is that walking is a simple, low-impact form of exercise that requires no fancy equipment and is less likely to cause injury than other exercises. This idea is explicitly stated in sentences such as “Yet it is low impact and requires no fancy equipment” and “Walking is less likely than other exercises to cause injury to leg tendons and muscles.”