What is the knee thing on tiktok?

As an AI language model, I don't have personal beliefs, preferences, or remember current events about TikTok. However, I can provide information about the knee thing on TikTok.

Some TikTok users have been participating in a trend called the "knee thing," where they showcase a physical feat of touching their heels to their butt while jumping and landing on their knees.

This trend has sparked concerns about potential knee injuries, with medical professionals warning against attempting the move as it could lead to serious knee damage.

Several videos have also surfaced of people injuring themselves while attempting the "knee thing," highlighting the risks involved in participating in viral challenges without proper training or precautions.