It was a couple miles and it stayed pretty comfortable the entire time. My butt is very tired but not in a way that makes me feel like I need to take the plug out.

It's a 2.5 inch enema retention plug from silicone nozzles.com in the softest silicone that they offer. I think I can safely recommend it as being comfortable to wear while doing exercise. Not necessarily intense exercise because I haven't tried it with that yet, but I am confident that it would be compatible with hiking and just about anything similarly demanding.

I've been wearing it pretty much nonstop for about a week now and I am very happy with it. I would definitely say that if you have enough experience to know more or less what kind of plug you want and are ready for then you should consider looking into something from siliconenozzle, although because of their diverse and unique plugs, as in basically all of them are one off designs that only come in a single size, I don't think I can recommend them to people who are less experienced or knowledgeable about what they want and can handle.

I'm very tired so hopefully this all makes sense.