I will keep this one very succinct, but this thread for the OG Solaris is a good place to start. If you are not already familiar with the Solaris, which is a hybrid IEM that meshes two driver types, many aspects of the OG Solaris are still pertinent. https://www.superbestaudiofriends.org/index.php?threads/campfire-audio-solaris-raising-the-bar.6926/ The Solaris 2020 is an update that addresses a few things with the OG Solaris, at least in my mind. None of these issues were deal-breakers, and some may even be inclined to prefer the OG. In other words, I am not suggesting that everyone upgrade; but rather read and consider before doing so. OG Solaris' laid-back upper mids (and lower and maybe overall treble) which was a vocal complaint by more than a few. Keep in mind that more than a few preferred this presentation. I was OK with it and continued to use the Solaris. OG Solaris' physical footprint, too long a nozzle, too large a housing. I wasn't a fan of this, but I could like with it. Lets first take a look at the physical differences between the OG Solaris and Solaris 2020. I took a few photos to give you guys a better idea. The dimensions are smaller all around. The OG Solaris is black / gold. The Solaris 2020 is all black. As for whether these are suitable for exercise, definitely much more than before. However, the fit isn't quite as snug as the Ara / Andromeda type housing. The latter have nozzles that taper which allow for deeper insertion if desired and snugger fit in the concha. With the Solaris, there's only so far that I have shove them into my ear.