Walking is not the most exciting form of exercise a person can take on for fitness. Yet it is low impact and requires no fancy e

quipment. That makes walking a simple activity for those new to exercise. Walking is less likely than other exercises to cause injury to leg tendons and muscles. All it requires is a good pair of sneakers—no cables, stylish outfits, or weights required. Of course, a person could increase the benefit of a workout by adding weights or speed walking.
Which of the following sentences comes closest to stating the main idea in this paragraph?

Yet it is low impact and requires no fancy equipment.
That makes walking a simple activity for those new to exercise.
Walking is less likely than other exercises to cause injury to leg tendons and muscles.
Of course, a person could increase the benefit of a workout by adding weights or speed walking.