Arm your young scientists with knowledge about anatomy as they build their own model of the elbow joint. Help them get a firm grasp on how muscles and bones interact to allow movement as they try different positions for the muscles on their models. In the activity, groups work together to create a bicep muscle simulation, then, when finished, are challenged to create a tricep. In addition to the model, each child answers some analysis questions about muscles and bones. For upper-middle school or high schoolers, encourage them to create their own, more accurate model at home.