What are the long term effects of a BBL on the gluteus muscles?

The great thing about this surgery is that the transformation that occurs in a couple of hours in the operating room trumps any period of time in the gym.  Having said that, lunges, squats, and other exercises that cause hypertrophy of the gluteus muscles will help the result. 
Squats and lunges after a BBL will only increase muscle bulk and definition which is probably a good thing in most patients looking to achieve a more projected, lifted buttock.  However, just make sure that the body fat percentage is held in check or you will lose some of the fat.  And do not overdo it when you return to the gym; assess tolerance as your gradually build up to what you were able to do before the BBL.
Kenneth Hughes, MD, ABPS Board Certified Plastic Surgeon
Los Angeles, CA

Hello dear!
Thanks for the question and provided information as well.
Injecting fat under the muscle is dangerous and carries many health risks. This is why no doctor should incur in this practice.
l recommend you to make an appointment with a board certified plastic surgeon to talk about your goals and anything you need to know.
Good luck :)