How to do a modified crunch If you’re unsure how to perform a crunch without straining your neck, try the modified version to work your core as you gain the confidence to tackle the full move.

How Many Calories Do Crunches Burn? It’s unclear how many calories you’ll burn by doing crunches, since it can vary from one person to the next. However, if you’re tracking your calorie ...

Crunches can improve flexibility and posture as well. And they have the benefit of convivence "since you can perform crunches anywhere—whether it be at home or in a hotel room," says McDonough.

Doing crunches is a great way to build your core strength, but that can only happen if you're doing them correctly. Here, a trainer explains how to do them properly.