Crunch
The classic crunch. A precise contraction of the rectus abdominis. It works mainly the abs, with help from the obliques.
Flawless ranks it by sets logged: Gold, the third of eight ranks, starts at 50.
How to do Crunch
- Lie on your back with knees bent and feet flat, hands on your chest or lightly behind your head.
- Curl your upper body forward by contracting the abs, lifting the shoulder blades a hand's width off the floor.
- Keep the lower back on the floor the whole time; this is a short movement, not a sit-up.
- Lower slowly and don't pull on your neck with your hands.
These are the same steps you see in the exercise guide in the Flawless app.
Muscles worked
| Role | Muscle | Anatomical name |
|---|---|---|
| Primary | Abs | Rectus abdominis |
| Secondary | Obliques | Obliquus abdominis |
Muscle data from StrengthLog.
Why do it
- Upper abs through a short, controlled range
- Easy to add resistance over time
- Direct work on the visible part
How Flawless ranks Crunch
| Rank | Sets logged |
|---|---|
| Bronze | start |
| Silver | 10 |
| Gold | 50 |
| Platinum | 150 |
| Diamond | 300 |
| Obsidian | 600 |
| Painite | 1,000 |
| Antimatter | 3,000 |
Flawless ranks Crunch by sets logged: the number of sets you have logged over time. The ladder is the same for everyone, because it measures work done rather than strength relative to bodyweight. The rank updates after every workout.
Similar exercises
Questions
What muscles does Crunch work?
It works mainly the abs, with help from the obliques.
How do you do Crunch?
Lie on your back with knees bent and feet flat, hands on your chest or lightly behind your head. Curl your upper body forward by contracting the abs, lifting the shoulder blades a hand's width off the floor. Keep the lower back on the floor the whole time; this is a short movement, not a sit-up. Lower slowly and don't pull on your neck with your hands.
How does Flawless rank Crunch?
By sets logged: the number of sets you have logged over time. Gold starts at 50 and Diamond at 300, the same for everyone.
Try it free
Free on Google Play and the App Store. The whole log is free; PRO is optional.