[Katana]

Watch out for planks! They can make your waist wider. Ab work in general can do that.

I am doing normal planks for now to build my core strength so that I am able to do an alternative plank which apparently decreases waist. I think with the amount of fat on my waist, doing planks will lead to a decrease anyway (I need core strength so bad lol)

Alternative plank:
Move into a traditional plank position to prepare for a side plank. Lift your right arm and right foot off the mat as you turn so your torso faces toward the right and your weight is on your left elbow and the side of your left foot. Stack your feet or place your right foot just in front of your left foot. Straighten your right arm and point your fingertips toward the ceiling. Keep your body straight and hold for up to one minute. Switch so your weight is on your right elbow. You'll feel this exercise all along your oblique muscles and your transverse abdominis, a group of muscles that holds in your waist like a corset.