I agree with everyone else, food is a great equalizer. My runners arent crazy peas either but love melons, try a cool melon on a hot day or squash. Sitting with them is good suggestion too. They are considered a skittish breed, so fast or predator like movements have them running. I would try making their encloser smaller so that they are more enclined to check you out when you sit with them. Choose a phrase you want them to respond to, mine is "come here babies". Call out to them in a baby voice while you walk up to them, get in the encloser and just sit queitly with the treats on the ground near you. Depending on how well they respond you can try hand feeding them too, just stay queit until they get used to you and your voice. I raised mine from ducklings and they all run to me at the fence quacking away to say hi whenever i check on them.