Normal movement for me: I'm not really cognizant of them.

It really matters what the climate is, though. Colder weather/neutral weather: not as uncomfy, because they tend to shrink up closer to your body. Warmer weather, especially if you're getting sweaty in high humidity: yeah, they could stick to your leg or something. Gotta make sure not to sit on them. Man-spreading can help here when sitting down, or taking a wide step off center/stretching in a lunge (lol).

One time, in the pharmacy, I got this pain in them as I was walking around. Turns out that my right testicle had twisted around in it's sack (testicular torsion). I had to spin it in the other direction once I got to a private place to relieve the pressure. Was almost doubling over in pain because it felt like a little vice was starting to crush them more every time I took a step. No fun.

TMI? Sorry.