On the whole, when wearing strappy sports bra, compared with ordinary underwear, whether the bouncing and bouncing of the chest are significantly reduced when bouncing. When exercising, I feel very tight, which affects my breathing. In this case, I bought a small one. On the contrary, there is no strong sense of wrapping, and if I wear it loosely, it is the performance of buying a large one.

Shoulder straps: Strappy sports bra manufacturers tell you that when exercising, such as lifting your arms up and down, the shoulder straps should not slide down or stretch on the shoulders. There are adjustment buckles on the shoulder straps to ensure that the shoulder straps do not move at will and are adjusted to a comfortable state.
Cups: Full-cup sports bras (generally, there are more full-cups, and the fixation effect is good), the chest should be completely wrapped, and it will not run out at will when exercising. If the chest runs out of the top or side of the sports bra during exercise, it means the bra is too small; the manufacturer of the strappy sports bra tells you that if the fabric on the cups is not supported and there are wrinkles, it means the bra is too large.
Chest tip: The strappy sports bra manufacturer tells you to ensure that after wearing the sports bra, the nipple tips coincide with the most convex part of the sports bra, so that the fixed effect is better during exercise, and there will be no discomfort due to friction.
Strap: It should fit well with the bottom girth, and straighten your hands towards the top of your head. If the girdle strap moves up, the bra is too large or the straps need to be adjusted. The strappy sports bra manufacturer tells you that if there is a groove buckle, make sure you have the outermost row of buckles, so you can take a deep breath.