Trampolines, Jogging, Jumping Jacks, just to name a few of the activities where a woman with large breasts would find their tatas flaunting around like the talk of the town. And it makes me think, wouldn't that hurt? I mean, your meat pillows are going up at least 5 inches and then coming back down with all the force that you went up with, simply by the laws of physics, it would put stress on your chest, I mean, could the force resulting be enough to, I don't know, make her face plant or something? Would doing it repetitively hurt? I know you guys don't know but, it's late and I'm bored so I'll ask you questions you can only speculate on for the sheer fun of speculating on every guy's favorite subject: Sweater Pillows, Meat Melons, the twins peaks, the girls, you know the rest, Breasts.
Go ahead and make your most scientifically driven hypothesis on the physical quandary.
Feel free to use images to further your research