Hi I have had my boobs dun for about 2 yrs. I have 415s so my bra size is E now… When I go running. I wear 2 bra. Like a t-shirt bra and a high impacted sports bra.. don’t let the boob bounce. If u feel uncomfortable u should stop. I remember I used to get a bit of like a stich in my chest above the implant. U just need to listen to ur body.