I took up long distance walking a year ago, lost 3 kilos in 2 months (lol I know, minimal) I'm already in a perfect weight, but I wanted to test the theory, so I took up long distance Running in january this year. I lost 4 kilos in about 5 weeks.
-I did endurance running that time, which pushed my body for a prolonged time, burning more fat. when I got used to that, I cranked it up. so on and so forth.
The more intense the physical activity is, the more your muscles will work, using more stores of fat to fuel the body. simply walking does very little if youre not pushing your muscles at all.
If you feel fine and still relaxed at the end of the walk, you havent done enough.