As part of our ‘Animal including humans’ unit of work, we have been learning all about muscles and how they work. We now know that we need our muscles to be able to move our skeleton. We discovered that our muscles are attached to our bones by tendons and that most muscles work in pairs. As one muscle contracts, the other relaxes and vice versa. We had a great time making a model arm with a bicep and tricep! We could see that as the arm bent, the bicep contracted and as it straightened, the bicep relaxed.