Stomach crunch is a popular exercise to tone the abdominal muscles. However, there are several synonyms for stomach crunch that can add variety to your workout routine. One of the most popular synonyms is the sit-up. Sit-ups require lying down on your back and raising your upper body towards your knees. Other synonyms include bicycle crunches, leg lifts, reverse crunches, and side crunches. These exercises target different areas of your abdominal muscles, providing a well-rounded workout. Adding these synonyms to your workout routine not only adds variety but also challenges your muscles in different ways, leading to more strength and definition.