Can I bend down at the hips or knees to pick up stuff off the floor after BBL?

Ideal candidates are at a stable weight,  in good health , and have excess fat in some parts of the body and too little in other regions.  Gaining weight before the procedure is to no advantage and when you lose weight again the fat cells will shrink just like the donor site fat cells.  Typically, the transferred fat results in a significant increase in volume of the body site being treated.

Hello dear!!
Thanks for the question and provided information as well. 
Based on the recommendations for my patients 3 weeks is enough time to recover, it also will depend on the type of work you do when you return to your normal routine, I recommend to discuss your daily routines with your surgeon.Remember to always use your compression garment and follow your surgeons instructions.
Good luck :)