I'm 62 And Started The Cize Dance Exercise Program. My

I'm 62 and started the Cize dance exercise program. My feet, knees and legs became swollen so badly that I stopped the program, soaked in Epsom salts and elevated my legs. My feet and legs would come back to normal and swell again. I bought ankle and knee supports but they did not help. My bones are small so why is this happening and what athletic shoes can I use to prevent this repetition? I don't retain water.