Exercise is the most effective and quick method to slim your waist. Beauty therapists recommend doing an appropriate amount of exercise in the morning and evening, which helps to consolidate the results. Every day after waking up, lie on your back in bed and stretch forward for about 10 seconds without holding your breath. When lying on your back, try to stretch your feet as much as possible. Bend your right knee at a 90-degree angle and lean it on the left side of your waist to stretch, with your left hand following alongside.