Basic crunch — targets the upper rectus abdominis. Simple but effective core exercise when done with proper form. Simple, no equipment needed. Effectively targets the upper abs. Easy to progress with weight or decline angle.
How to Do Crunch: Step by Step
Lie on your back, knees bent, feet flat
Hands behind head (don't pull on your neck)
Curl shoulders off the floor using your abs
Lower with control
Common Mistakes to Avoid
Pulling on the neck with hands — fingertips lightly touch head
Using momentum instead of controlled ab contraction