Sitting on your knees won’t cause a medical emergency. But if you frequently sit in this position, it can strain your knees and ankles.
Is sitting on your knees healthy? - Quora
Squatting and kneeling may be better for your health than sitting
7 Exercises for Overweight or Obese People with Knee Pain
Kneeling vs. Sitting at Office: Which is Better for You?
Optimal Sitting Postures After Knee Replacement
Want a stronger core – skip the sit-ups - Harvard Health
Is Sitting On The Floor Good For You
5 Tips for Healthy Knees
Is Sitting on Knees Healthy or Bad for Your Health?
11 posture mistakes you're probably making — and how to fix them