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 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. 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 lists represents text evidence pieces that all support the main idea in this paragraph?

Walking is fun to do, less likely to cause injury, requires good sneakers.
Walking is easy to start, not worth the time for fit people, needs weights.
Walking is not exciting, needs weights to make it beneficial, safest exercise.
Walking is low impact, requires no fancy equipment, less likely to cause injury.