Best Type of Breast Augmentation for Petite and Athletic Woman?

Hi, I am 5'1" tall, I weigh 115lbs. I am very healthy and active. I currently wear a 32 A bra. I have two children (breastfed). An average week for me consists of running 5x, gymnastics 1x, yoga 1x and strength training 1-2x. My doctor has suggested that with my lifestyle, I should get gel Breast Implants in the subglandular placement with 250cc. After reading everywhere, many doctors say that with such a small frame, the implant will be noticeable and I will have rippling. But my doctor says I cannot work out hard with submuscular? HELP! Afraid of golf ball boobs!