First of all is it possible to buff them up by training? which I think it is, but how?
Is it possible to do exercises for the lower part of pecs to give a nice push to fat tissue upwards?
Do these actually work? decline benchpress? cable for pecs a bit downwards?
Or is that sadly a myth and it's just normal chest training for chest?
Hey there IB, as a female, i believe what you are eluding to when you say "...buff them up by training...." is that you are looking to achieve the look of a "lift" if you will for the breasts. What you can do is increase muscle behind/around the breasts, but the fact of the matter remains that the breasts are just fatty tissue and will increase in size with weight gain and decrease in size with weight loss. To buff them up, or lift them up......if you cannot achieve what you want through training, then the only other way to lift them up is by surgery.
So not quite clear on what you are tryin to achieve through the description you posted....I will tell you that i have built up my pecs quite a bit, but did not result in any push up of fat tissue. And i've had a breast augmentation/lift approx 13 years ago. Actually i did a breast reduction and a lift at the time. Did not opt for any implants as the doctor said that i had sufficient tissue at the time.
If you have implants, then they are always up lol.
Good luck.