I've been to pilates for years and before that I did a huge range of different exercise classes. There are things I can do easily but struggle with other things that some people find easy. My pilates teacher is excellent about explaining why and offering a different movement. We all have very different bodies, I'm strong but not particularly flexible, I have a tilted pelvis with a slight rotation to the left but my most limiting factor is I have long limbs and a relatively compact body with a particularly short lower back, I have no space between my last rib and my hip. This really limits my ability to perform some exercises fortunately pilates is not a competitive sport. No I can't do the splits.