If the hamstrings are tight and the abs over active, what muscle groups will be lengthened or weak?

Is it rare to have scoliosis and double jointed shoulders?

For yokos physical fitness class she is supposed to do a certain amount of aerobic exercise what is best for her

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the dependent variable in galileo's experiment?