Aerobic exercise is good for many of the main systems of the body, it does not help flexibility as it is is a type of exercise. Thus option A is correct.
There are four basic types of exercises Aerobic, strength, flexibility and balance.
Doing aerobic Exercise increase heart beat rate, breathing. It prevent diseases like diabetes, colon and breast cancers. the types of exercises are jogging, mowing, dancing, swimming, biking etc.
Flexibility Exercise which include stretching, yoga, tai chi, and Pilates help in improving the flexibility.
Strength or Resistance Exercise include barbells and weight plates, which make our muscle more strong, help us to do everyday activities, climbing stairs etc.
Balance exercises prevent falls, which is commonly observed in older adults, lower-body strength exercises included in this categories.
Thus option A is correct.
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