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.
Appalachian Trail
The Appalachian National Scenic Trail, generally known as the Appalachian Trail or simply the A.T., is a marked hiking trail in the Eastern United States extending between Springer Mountain in Georgia and Mount Katahdin in Maine. The trail is about long, though the exact length changes over time as parts are modified or rerouted. The Appalachian Trail Conservancy describes the Appalachian Trail as the longest hiking-only trail in the world. More than 2 million people are said to take a hike on part of the trail at least once
the chorus, she sings: "It might sound like I’m an unapologetic bitch / but sometimes you know I gotta call I like it is." The song was allegedly written about Madonna's ex-boyfriend Brahim Zaibat. She told "Rolling Stone" that the song "it's like, fuck you, I'm going to have fun. You think you're going to ruin my life and you think that it's over for me, but guess what? It's not. Life goes on.