Recently got lipo with fat transfer to hips. I wanted to know how the fat will behave when I start going back to the gym?

Dear bernie818,Fat viability depends a lot of surgeon technique. The fat has to be placed back into the buttocks as soon as possible so that it has a greater chance of survival. It has to be placed carefully so that not too much fat is placed in only one area. In most cases 30-40% of transferred fat will be lost after few months. No fat will transform into muscles. Daniel Barrett, MD, MHA, MS 
Certified, American Board of Plastic Surgery  
Member, Am. Society of Plastic Surgery

Congratulations on your recent surgery and thank you for sharing your question about your post operative recovery and results after your surgery.  Final results can take 6-12 months for all the swelling to subside.  At our office we actually see all of our surgery patients the very next day after surgery and then again at two weeks and beyond. We enjoy staying closely connected to our patients and enjoy giving the extra attention and service. Your concerns are important to discuss directly with your board certified plastic surgeon.  He or she will appreciate the open communication and will want to help you. I hope this is helpful and wish you all the very best.  Sincerely, Brian S. Coan, MD, FACS

The upper outer thigh or hip area has very little muscles.
It will not change much from exercise.
Fat will not turn into muscle anywhere in the body.
That area has a tendency to have more fat be observed after fat transfer compared to a Brazilian.
Your final results will be around three months after the procedure.
I don't think exercise will have any impact I neither fat nor muscle on the hip area.
Best,
Mats Hagstrom M.D.