After over a decade of practising Pilates, there's one thing I've learned about the method above all else: consistency is key. When it comes to really noticing those strength gains, you have to stay on track - and it can be difficult to notice progress until you start to advance a move.
There are very few (if any) Pilates moves I haven't tried - but this isn't to say that I'm an expert at any of them. I'm humbled pretty much every time I take to the mat or reformer - and I wouldn't have it any other way.