Are 650cc breast implants too big for me if I am 5'11 and weigh 175-180 lbs?

In my own experience I have certainly use implants of this
size and even larger in woman of larger stature. Generally speaking, larger
frames will require a larger implant to have the same visional impact as a
smaller implant on a smaller frame. As
far as exercise goes, all bets are off because implants will increase the
weight on the breast, increase the weight on the shoulders and the strain on
the back.

Thank you for the question. Despite good intentions, online consultants will not be able to provide you with specific enough advice to be really helpful. Generally speaking, the best online advice I can give to ladies who are considering  breast augmentation surgery (regarding breast implant size/profile selection) is:
1. Concentrate on choosing your plastic surgeon carefully.  Concentrate on appropriate training, certification, and the ability of the plastic surgeon to achieve the results you are looking for. Ask to see lots of examples of his/her work. Sometimes, it is necessary to seek several consultations before you feel comfortable about your choice.
2. Have a full discussion and communication regarding your desired goals  with your plastic surgeon. This communication will be critical in determining  breast implant size/type/profile will most likely help achieve your goals. 
In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. I have found that the use of words such as  “natural” or "C or D cup”  etc means different things to different people and therefore prove unhelpful.
 Also, as you know, cup size varies depending on him who makes the bra; therefore, discussing desired cup  size may also be inaccurate. Again, best not to discuss your goals and/or judge the outcome of the procedure performed based on achieving a specific cup size.  The use of computer imaging may be very helpful during the communication process.
 
3.  Once you feel you have communicated your goals clearly,  allow your plastic surgeon to use his/her years of experience/judgment to choose the breast implant size/profile that will best meet your goals.  Again, in my practice, this decision is usually made during surgery. I generally select appropriate breast implant size/profile after the use of temporary intraoperative sizers and viewing the patient's chest in the upright and supine positions.
I hope this (and the attached link,  dedicated to breast augmentation surgery concerns) helps.

The best cosmetic result in
any particular breast augmentation patient depends on a variety of factors,
including: your individual anatomy, realistic expectations, a thorough
discussion with the plastic surgeon about the options, and an understanding of
the pros and cons of any particular implant choice. Proper sizing is not just
about the number of cc’s. The thickness of your tissue, breast dimensions which
include the width, height, and projection, as well as chest wall width all need
to be considered when choosing an implant. Trying on implant “sizers” of
various shapes and volumes while wearing a tight t-shirt, bra, or bathing suit
at a preoperative visit will help you and your surgeon choose the optimal
implant.Keep in mind that following
the advice from a surgeon on this or any other website who proposes to tell you
what to do without examining you, physically feeling the tissue, assessing your
desired outcome, taking a full medical history, and discussing the pros and cons
of each operative procedure would not be in your best interest. I would suggest
that your plastic surgeon be certified by the American Board of Plastic Surgery
and ideally a member of the American Society for Aesthetic Plastic Surgery
(ASAPS) that you trust and are comfortable with. You should discuss your
concerns with that surgeon in person.Robert Singer, MD FACSLa Jolla, California

650 cc is larger than most patients want or need especially if you are a runner. The correct size implant fits your dimensions of your chest and breast and the appearance that you want to achieve. It is difficult to make an accurate suggestion without a physical exam. This size implant may not be out of proportion since you are 5'11" and 175 pounds. Many athletic patients want to be slightly on the smaller end of the spectrum of appropriate sizes for them.I have found that using the VECTRA device really reassures you that the size is right for you. Make sure your surgeon is board certified by the American Board of Plastic Surgery and that he is experienced with breast augmentation. Make sure that he understands your desires and concerns.

The correct size implant is the one that fits the dimensions of your chest and breast and provides the appearance that your desire.  This statement is true in general but does not address the specific answer for you.  It is impossible to make an accurate suggestion without a physical exam.  In general, a 650 cc implant may not be out of proportion for an individual who is 5'11" and 175 pounds, but it is quite large for someone who wishes to continue as a runner.  For my athletic patients, I usually recommend implant volumes of 450 cc or less.  At 5'11", I would suggest looking at the 530 cc implant again.  Spend some time trying on different size implants and honestly evaluate what your goals are with regard to both appearance and physical activity.  Best wishes.

650cc breast implants are quite large. It will depend on your breast measurements taken by your plastic surgeon. Your surgeon will measure your breast base width and give you a range of sizes and profiles that will best fit you. For more information on breast implant sizing please see the following linkl: