[novice1]

I put the cable under my shirt.  If find that the more the IEM isolates, the more "thump" I hear when running.  I also find that wearing a hat or sweatband (over my ears) also helps to reduce the thump, and especially running the cable over the ear.  The best thing might be to review the IEM shootout list for ones that got ranked low for isolation.  I am thinking about the Meelec CW31 for running.