Try this workout which I do every night:
•cardio - jumps, running on the spot, skipping
•muscular training - crunches, sit ups, squats (I do sixty of each but whatever works for you)
•stretches - calf, thigh, hamstring, leg on the bar and lean over, splits side and front, straddle etc.
•ballet - plies, tendus, foot stretches, grand battements, changement.
By doing the basic ballet movements at the end of the workout you are enabling your body to do these without hurting anything. My rule is: if it hurts a little stop immediately. If you do this workout every night I think you can get by (atleast while you are still only beginning) on one class a week. I'm thirteen and this workout keeps me going over the summer when I have no ballet. Xxx