Any time you take on a new exercise, your body will be under pressure to adjust. This puts it in a vulnerable position so be patient with it. It's common to get cramps if you're new to pilates or barre training where the focus is on isolated movements and isometric holds and pulses.
Balancing your entire weight with your heels raised is also a big ask of your body!

If you experience cramping through the soles of your feet regularly, it is definitely worth asking your GP about.

After Ballet Sculpt, try these moves to relax and comfort the muscles in the feet. I also find it helps with my circulation, which is naturally pretty crap. Great on these cold nights!