A

Exercising regularly not only helps you keep slim, but also improves your overall health and well-being. Different exercises produce different results, as they focus on alternate parts of the body.There are four broad exercise categories: endurance, strength, flexibility, and balance. Many peopleoften only focus on one exercise type, but including all four in your workout will produce betterresults and reduce your risk of injury.

Endurance

Endurance exercises increase your breathing and heart rate. By doing endurance exercises, you areworking to keep your heart, lungs, and blood-flow system healthy while improving your total fitness.Over time these activities will make everyday activities seem easier.

Strength

If you want to build up your muscles, then strength exercises, which are also known as "resistancetraining", are right for you. Even the slightest increase in strength can make a huge difference in yourability to carry out daily tasks. Developing strong muscles also reduces your risk of weak bones.

Flexibility

Flexibility exercises help stretch your body's muscles. This allows for more freedom of movementfor other exercises and can also improve your range of motion, posture,ability to breathe deeply, andblood flow. Also, it reduces the muscle tension caused by stress.

Balance

Balance exercises help prevent falls and are especially important to older adults, helping them stayindependent. Most good balance exercises are ones that keep you constantly moving with your feeton the ground. Heel-to-toe walking and standing on one foot are simple ways to improve balance.

21. How can a person benefit most from their exercise routine?

A. By combining different exercise types together

B. By having sufficient rest between their workouts

C. By concentrating on one training aspect at a time.

D. By increasing the frequency of their training gradually.

22. Which exercise types are most useful to improve a person's breathing function?

A. Strength and Balance       B. Flexibility and Balance

C. Endurance and Strength     D. Endurance and Flexibility

23. Which part of the body plays the most important role in balance-related exercises?

A.Arms.       B. Legs.        C. Waist        D. Neck