Nina investigates how we can get better at climbing - with the help of Felix, her touch neuron. Experimenters Evie, Sonny and Will visit Nina in her lab and discover that we use our arms and legs to climb and that our legs are usually stronger than our arms. Next, they go to a climbing wall to meet a para-climbing champion and see how she uses her weight to help her climb. Finally, they have a go at climbing themselves to find out how to stay steady and climb better.