A:
You might try changing the earphone tips. I purchased the Comply Premium, model Tsx-500, Comfort Plus Earphone Tips. This made a huge difference in comfort and ear canal placement.
I also recommend you look at the online tutorials, via YouTube, to make sure you are placing them in your ear correctly.
I work out, mow the yard, etc. with my BlueBuds X, and have no problems whatsoever with them falling out.