Fill in blank (ii).

Directions: Read the passage and answer the following question.

Some parents force their children to study as it is thought to be far more useful for life than play. Through the experience of play a child enriches his life and becomes strong not only ____(i)____ but also ____(ii)____. There is ____(iii)____ reward at every level of effort, provided it is regular. Light regular exercise makes your heart run ____(iv)____ for at least 20 minutes thereafter. The reward is immunity to colds and flu, less stress, slightly healthier levels of cholesterol and blood pressure. The figure trims down ____(v)____ but only gradually.