First of all, if you are blindly showing off your figure, but you don't care about your own problems at all, I think your chest will droop. Because since you are in such a good figure, you must weigh a lot, and then you have been running on the treadmill, which is sure to happen. Presumably this beautiful woman is also uncomfortable.
However, if this beautiful woman is smart enough, she will buy that kind of protective underwear or sportswear to protect herself to a certain extent, so naturally there will be no such problem. And when I run on the treadmill, I will feel less uncomfortable. However, the premise is that this underwear has certain quality assurance and can stand up. Of course, if you can't stand it, the effect will definitely be similar to the last one. Therefore, we must ensure the quality of underwear and change it frequently.
In addition, the Internet is very developed today, and you can use this advantage to find some authoritative and useful methods. In this way, the effect can be better in the future fitness, and it will not be so uncomfortable. Of course, if the method really doesn't work, I suggest you stop using the treadmill and do some less uncomfortable exercise. Otherwise, it will be bad if it really sags. But it usually droops when it's unbearable.
Furthermore, I don't think it is necessary for girls with big breasts to show off blindly, which may cause a lot of unnecessary trouble. On the one hand, you may be attacked by a pervert, that is, a person whose eyes will light up when you see it, and then you will be harassed every day, so it is better to be conservative. But it's also possible that you like it, and it doesn't matter. Of course, I'm just suggesting.