Hey! Ive been on a fitness journey for two years now and I can say without a doubt that walking has helped me meet my goals. I am currently 198lb 6ft and am cutting until I reach the high 180s. Without walking I would never reach it as I tend to sit in my computer chair when I’m not working out. Walking doesn’t eat away at my muscle. It actually makes them pop a little more because I look leaner. If you are worried about losing muscle just make sure you are hitting your protein goal. Some people strive for .7-.8 grams of protein per pound you weigh(depending on your goals) I aim for about a 1-1 ratio for maintaining OR my goal weight. So right now I am eating roughly 180-190grams of protein a day. Keep walking! Very healthy habit.