I have the same problem. I generally log it as "health club exercise, general". I saw on other websites a few approximate possibilities for calories burned and the "health club exercise, general" was in the middle of the estimates. I would say I do the intermediate pilates moves, so your calories burned might be a little higher if you do all of the advanced moves. If that option doesn't work, look into the calisthenics options....they might work if you burn less or more calories. Hope this helps!!
BTW Any reason why they skip running at 10.5 and 11? They have every other option except the one I need!! Errrr! LOL