Resistance Is Futile

During the lesson on Monday I noticed I was getting a lot of cramp in my arches while pointing my feet and toes so I asked the teacher about it at the end. She informed me I had weak arches (oooh blunt!) and that I need to exercise my feet every day with a resistance band, put my toes in it and point and flex repeatedly. Tried it tonight but am still getting cramps, maybe it takes a while. 

On a plus note my turnout is quite good now, feet are in a straight line in first position and fifth isn't feeling so odd.