It’s remarkable how much James MacArthur and Mackenzie Astin resemble each other; I honestly believed they were related until someone pointed out otherwise. Seeing Astin on screen gave me a strong sense of nostalgia, like stepping back into the era of 1950s Disney films. *Iron Will* is an enjoyable movie. The initial scenes unfold at a leisurely pace, but things quickly become more engaging with the dog-sled racin…