I have lucid dreams pretty often in my opinion, a few a week. When I'm in a lucid dream, I sometimes sit down, or stand up or walk around or do whatever, but while I'm doing this, I try to remember the feel of it. I often become lucid merely because I've trained myself to know the feel of a dream, the gravity of most of my dreams, my average physical ability in non-lucid dreams, knowing the feel of how I move and stuff.