I am new to BP. I am 5'9", 145 pounds, 36A. I am flat chested but with broad shoulders and a muscular back and that makes shopping for sports bras a nightmare because if I buy to fit the band I don't have enough to put in the cups. According to the size chart I might have even needed a large in this bra but I tried a medium and it worked out perfectly. This bra is soft and comfortable and I actually forgot I had it on and ended up wearing it around the house longer than I intended. I cannot wait to try other BP sports bras now!