SOLVED. Works for ballet company, best friend is firefighter, has eating disorder, starts Pilates, dates brother's best friend I think. [s]

[Sarah]

Main character works for ballet company, has eating disorder, runs on treadmill a lot, best friend is firefighter, takes up pilates, I think dates brother's best friend, brother dates a ballerina from the ballet company

[Rachel]

Sounds like Running in Heels

[Sarah]

Rachel wrote: "Sounds like Running in Heels"

YES! That is it, thank you Rachel!

[Rachel]

You're welcome! I knew it straight away from your description.