The crunch is one of the most popular exercises for those looking to get that perfect set of abs, however, if you’re performing a crunch, you have to make sure you're doing it properly.
When doing a crunch, keep these form points in mind to ensure that you actually work your abs and not your neck or low back.
1- Place hands long to your sides and reach your fingers toward your feet to prevent lifting at the neck and shoulders. For a modification, support your head with your hands.
2- Pull abdominals in and flatten, rather than pushing them out or forcing your low back to the floor.
3-Keep neck long and neutral with eyes gazing toward abdomen rather than pushing your chin out, straining the neck or looking toward the ceiling.