I have a very large chest and I am a bit overweight. So I decided to start running. I just doubled up on normal walmart 'high impact' sports bra's. A few weeks into my running regimen I started having terrible shoulder pain in the joint, down the side and behind the scapula. I stopped running thinking it was my form that caused the injury. Nope it was the lack of support and the jarring of my shoulder from the incorrect bra. Well I ran a 5k today after not running in 3 weeks because of my shoulder injury. I bought the ENELL maximum impact sports bra in a size 3.  I tried it on in the store and technically fit in a 4, but the 4 was too big. I needed the 3 to hold my chest in. Anyway, I ran today with the sports bra and my injured shoulder and i can say i had NO PAIN. Not one tiny ounce. It was AMAZING. I got mine from a runners store. I would go try one on before you purchased it online. But really, really it is a MUST HAVE and it is amazing. Don't do what I did and wait for an injury to invest in one of these. The price is steep, but trust me a hurting shoulder is awful and for large chested women it is a must have. Even if you buy one and wash it every day. Really. It is that good. If I had this bra before yesterday, I would have started training again. But as it is, I can restart my training program and continue to run. I am a 39 DDD and before I lost a bit of weight I was a 40H. Nothing fit or gave me support. Take care of your body. I have tried EVERY OTHER SPORTS BRA. They do not work. Really, this one is the mack daddy of sports bra's. The lady at the running store told me that too. It is a bit hard to get into, but trust me, you will have no pain.
xoxo