Is 400cc smooth silicone implants above the muscle a good idea for my fit body type? (photos)

Thank you for the question. Based on your photographs, I think that you are starting at a good place and should have a very nice outcome with breast augmentation surgery.
There are pros and cons to the placement of breast implants in the “sub muscular” position versus the "sub glandular position”. The vast majority of breast implants placed in the "sub muscular" position are really being placed in the "dual plane" position ( partially sub muscular, partially sub glandular). I think it is in the best interests of most patients (including athletes) is seeking breast augmentation surgery to have implants placed in the “dual plane” or sub muscular position. This positioning allows for more complete coverage of the breast implants leading to generally more natural feel/look of the implants in the long-term. This position will also decrease the potential for rippling and/or palpability of the implants (which may increase with time, weight loss, and/or post-pregnancy changes).The submuscular positioning also tends to interfere with mammography less so than breast implants in the sub glandular position. The incidence of breast implant encapsulation (capsular contraction) is also decreased with implants placed in the sub muscular position.On the other hand, sub glandular breast implant positioning does not have the potential downside of “animation deformity” ( movement/ distortion of the breast implants seen with flexion of the pectoralis major muscle) they can be seen with breast implants placed in the sub muscular position. I hope this, and the attached link, helps. Best wishes.

I appreciate
your question.

The best way
to determine implant size is based on chest wall measurements that fit your
body. Once we determine that we can choose the profile based on what you
want or need to achieve.

Implants
under the muscle, there is less risk of capsular contracture. Anatomic
implants tend to give a more natural shape with more nipple projection.

The best way
to assess and give true advice would be an in-person exam. Please see a
board-certified plastic surgeon that specializes in aesthetic and restorative
breast surgery.

Best of luck!

Dr. SchwartzBoard
Certified Plastic Surgeon

Director-Beverly
Hills Breast and Body Institute

#RealSelf100Surgeon

unless you are in body building  contests, go under the muscle you will have less capsular contracture and less rippling