I love kickboxing, boxing and weight training. How long after a BBL can I start with my upper body workout?

Always ask your plastic surgeon about specific activities and when they can be resumed after surgery.
However, if you are asking this question hypothetically, my response is working out may increase the muscle mass and in turn improve the shape.  I usually ask my patients to wait from 4 to 6 weeks, depending upon how the healing goes.  
Healing should be far enough along to reduce the incidence of complications.   I advocate continued  exercise after a BBL as long as you do not lose body fat.  Keep an eye on your weight, and decrease the amount of exercise as warranted.  If you gain weight that is fat, some of the fat will likely be associated with the buttocks.
Kenneth Hughes, MD, Board Certified Plastic Surgeon
Los Angeles, CA

Thank you for your question. Every surgeon will have his/her own preferences as to recovery for specific procedures. It's best to follow your surgeons specific advice post-operatively. Usually, patients can return to light activities almost immediately after surgery, normal activities 2 weeks after surgery, and vigorous exercise 4 weeks after surgery.  We usually experience a slow steady improvement for 3 months or so after surgery.

Hello kingdoll,
It’s a pleasure to answer your questions! Typically, 2-4 weeks after Brazilian Butt Lift (BBL) surgery, patients can gradually resume physical activity (starting with their upper body workout, for instance), yet avoiding strenuous exercise for at least 6-8 weeks. It is always best to consult with your plastic surgeon first, before starting to work out, since every patient is unique and will have different healing processes and deadlines. Enjoying physical activities such as kickboxing, boxing and weight training would be beneficial in your recovery period, since it is highly recommended to exercise and diet after your procedure to have long-lasting results. Without proper diet and exercise, you may gain weight after surgery and may lose the wonderful results of your cosmetic surgery. Best regards! Dr. De La Cruz. 

Thank you for your question.
Every plastic surgery office has their own set of pre and post operative instructions that they recommend their patients follow. It is most important to follow the instructions of your surgeon.

Hello dear!!
Thanks for the question and provided information as well. 
I recommend my patients to wait at least 4 weeks before resuming their workout rutine.
If you have any concerns, i suggest you to follow up close with your plastic surgeon.
Hope this is helpful. Good luck :)