Clare climbs steps every day to stimulate her heart and lung functioning.She does this to remain fit and healthy.Claire's exercise is a type of

A) anaerobic exercise.
B) muscle-strengthening exercise.
C) aerobic exercise.
D) flexibility exercise.

Clare's exercise of climbing steps is a type of aerobic exercise because it involves continuous movement and increases heart and lung functioning. Anaerobic exercise involves intense bursts of activity for short periods of time, muscle-strengthening exercise involves working out specific muscle groups, and flexibility exercise involves stretching and improving range of motion.