Shortly after the first pair of anklets were put on Decorah… Kay realized just how much smaller he is than Thora. The anklets were too big for him and would have been dangerous for Kay to work on fist training. On the plus side, just having anklets on was still training for Decorah.
With the proper size anklets on Decorah, Kay was able to safely proceed with fist training.
His tail feathers are another story. The tail feathers get a good start, then the blood supply seems to vanish and the feathers dry up and break off. At least the feather follicles are still there.