Labels:book | bulletin board | dialog box | hakham | monitor | traffic light | web site | window OCR: HELP Test your strength Try these simple activities test the strength of your muscles Activity Work with friend. One person lifts - couple books. The other should make sketches any changes in muscle shape in the arm. Remember that muscles can only pull, not push. Which muscles pull when you lift the books? Which muscles pull when you lower the books? Activity Test the strength your fingers by picking up some bathr room scales. Press your thumbs downwards on the scales and record the weight achieved. Now repeat the activity this time put the scales ona table and press both fists down on the scales. Write down the weights achieved Repeat the activity again, this time compare the weight achieved by using the right and then the left hand strenath afriend Beneat compar usino
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