Walking is an ideal exercise for people who a. desire to engage in an activity that is easy on their joints b. desire to engage in a high-energy activity c. desire to engage in an activity requiring intense concentration d. desire to engage in an activity requiring high endurance

A. desire to engage in an activity that is easy on their joints.

Explanation:

Walking is a very effective aerobic exercise for health. Walking is a perfect physical activity: it is easy, light, improves your spirits and is capable of providing health, beauty and fitness. Walking is a low impact exercise, so it is ideal for people who do not wish to force their joints.

It is an exercise that can be practiced by anyone, regardless of age and fitness.

Walking, besides, has the advantage of being the safest of all aerobic activities - both from the cardiovascular and orthopedic point of view. Even by running it with quick steps, it is unlikely that the heart will be overwhelmed. In addition, unlike running, the risk of joint injury - especially in the knees and ankles - is much lower.