You can always adjust movements to your level, even if it doesn't look close to what she's doing. Just remember to clear your mind and listen to her soothing voice for half an hour (for some of us it's extremely hard to concentrate, so we have to start over and over and over again) and remember to listen to the body - she reminds that a lot, because it means everything - and engage your muscles, all the muscles that you are capable of controlling, especially core and pelvic muscles, but also face etc. Even if you just sit on the chair, work on that posture mindfully. It's so hard to stay motivated when you feel like shit, but doing just a 7 minute couch excercise video is a great achievement in a shitty day.