Now have the students go back to the predictions they made. Read the statements below, write whether it is true or false, then write a sentence or two supporting your answer. If you use a muscle on one arm more the same muscle on the other, then the arm that is used more will have a bigger bone. Bones are not brittle, they bend before they snap. Exercises that put stress on your bones and ligaments cause the kinds of structural changes that reinforce the bones and makes them stronger.
Swimming is more beneficial to developing stronger bones than running or walking.
Weightlifting should be encouraged at all ages because it will strengthen the growth plates at the end of the bones. Calcium fortified orange-juice has as much calcium as a cup of milk. Now imagine that you and a friend are on an archeological dig, and you find two skeletons. Your partner makes the statements below. To each statement say whether you agree or disagree, and write a sentence or two from the passage that supports your argument.