Summarize this article in one sentence.
One of the primary rules is that generally you want to look broad and large as a male model. If your shoulders are angled away from the camera, it slims your profile. Keep your shoulders relaxed and facing forward.  To enhance the look of your shoulders, lean forward about an inch or two (2.5 cm to 5 cm), bringing your shoulders closer to the camera. There are times when you’ll be photographed from the side or that you’ll want angled shoulders, but most of the time squared shoulders are best. If you have any amount of gut, you’ll want to pull it in slightly by tightening your abdominal muscles. Make your stomach as flat as possible without sucking it in too much. This will slim your waist and also push your chest out a little. It also helps to straighten your posture, which lengthens your core muscles. Walking is a common “pose” for the male model. Practice walking with your body straight and your head held high.The pose requires one leg extended forward with the toes about one inch (2.5 cm) off of the ground. The back foot should be up on the ball of your foot. One arm is extended slightly forward while the other is slightly back. Lengthen your stride slightly beyond how you'd normally walk. This helps emphasize the pose, especially if you tend to take small steps. You have many options for how to lean, which are variations of leaning with your back to the wall or with one of your shoulders to the wall. If you lean with your back to the wall, bend one knee and raise your foot against the wall. Leaning on a shoulder, cross the foot that is closer to the wall over the other foot.  If you lean with your back to the wall, you don’t have to raise one leg, but don’t keep both legs completely straight. Bend one leg and have one forward and one back a little bit. When you are leaning, stay almost straight up and down. You don’t want your feet so far from the wall that you are at a significant angle.

Summary:
Keep your shoulders squared to the camera. Tighten your core. Work on the strolling pose. Lean against a wall.