Hi , thank you for the message, there are plenty of really good exercices to construct a structured off-ice routine and I think pliometric work outs would be best ( high jumps, long jumps, junping squats, side ski jumps, ankle jumps , lunge jumps , 10 repetitions of each and you can do the rotation 2 or 3 times ) and then obviously practice your static rotation jumps, double and triple turns. You will build a lot of strengh and consistency for your work on the ice