I love going hiking, which is what I prefer to call it.  Other countries have all sorts of terms for it like bushwalking, which is what Australians call it. 
Yes, I have heard that term.  I think that the British have some slang terms for it, too.  I like hiking, as well.
Yes, it's a popular activity no matter where you go in the world, not to mention all the health benefits of a good walk.
Definitely is good for the heart, soul, and body.  We hike up some small mountain trails in my local area.  It's a great family activity.
Well if you like a good trail, try out the Appalachian National Scenic Trail.  It's about 2,200 miles long give or take a few with changes over the years.
I have walked portions of the Appalachian Trail.  I haven't done the whole thing, because I don't have months to spend on it, lol.
Florida Trail
The Florida Trail is one of eleven National Scenic Trails in the United States. It currently runs , with planned, from Big Cypress National Preserve (between Miami and Naples, Florida along the Tamiami Trail) to Fort Pickens at Gulf Islands National Seashore, Pensacola Beach. Also known as the Florida National Scenic Trail (which applies only to its federally certified segments), the Florida Trail provides permanent non-motorized recreation opportunity for hiking and other compatible activities and is within an hour of most Floridians. The Florida
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