I’ve been trying to perfect my salah recently, and I read in ahadith that we’re meant lean on the left leg and also have both rump cheeks on the ground. I’ve looked at demonstrations and I cannot get my legs to bend like that and have my rump entirely on the ground at the same time, it feels like I’m gonna snap one of my knees or break my left foot.

Are there any exercises you teach people in masjids for this? Because I’m actually having to do stretches and warm-ups before my salat (I’m not even kidding).

Are there ahadith that say it’s only mustahhab?

https://www.al-islam.org/commentary-prayer-muhsin-qaraati/bowing-down-ruku-and-prostration-sujud