Eat less. Do cardio. Walking didn't help my diet much. Do like 30 minutes of running. Most importantly, eat less. I've found intermittent fasting to be the most effective. Try it. The easier version is that you eat normally 2 days, eat only the breakfast the next day, eat normally for 3 days, eat only the breakfast the next day. Repeat that week. As for me, I eat only the breakfast 1 day, eat nothing the next day, I repeat these 2 days while having a refeeding day (eating more than my usual) every now & then.