I do think any sort of exercise is good for MS but I completely sympathise with you in finding some of the physio exercises difficult . I tried a new zoom class yesterday where we were asked to walk on our heels ,the instructor might as well have asked me to do cartwheels! It was impossible and so a bit disheartening. I’m afraid I can’t say whether anything has improved for me by doing specific exercises but the MS PT who takes my weekly class says that not getting worse is a win. Good luck with your programme, you are definitely not the only one finding it hard . Best Wishes