How To Do Sit Ups : Strong stomach muscles give good core strength and are essential for all sports, besides also making you look like an adonis!! Sit Ups are a great way to start toning your tummy and are easy to do if you know how. Here are our top tips:Strong stomach muscles give good core strength and are essential for all sports, besides also making you look like an adonis!! Sit Ups are a great way to start toning your tummy and are easy to do if you know how. Here are our top tips: 1. Step 1: Find somewhere comfortable Make sure you find somewhere comfortable, like a flat, level surface. You could use a yoga mat to lie on to make it softer on your back. If you are in the gym make sure you are not obstructing anyone else’s activity. 2. Step 2: Position Lay down on your back with your knees bent and the balls and heels of your feet placed flat on the floor. By keeping your feet planted on the floor throughout the action you will be working your muscles harder as you push them down so your feet don't move. Put your hands behind your ears, with your elbows out to the side. You could cross your arms over your chest and touch your shoulders if you prefer. Don't grab the back of your neck as this can cause injury. 3. Step 3: Action Keeping your feet on the ground, tighten your stomach muscles and slowly lift your head first. You should feel the strain in your abdomen. Then lift the shoulder blades and pull up from the floor about half way. Hold the position for a few ...