How to Do the Cross-Body Crunch
Beginner core exercise — bodyweight.
The cross-body crunch is an ab exercise where you lie on your back and curl one shoulder toward the opposite knee, combining a crunch with a twist. The rotation brings the obliques — the muscles along the sides of your waist — into the movement alongside the front abs. It's done slowly, one side at a time, which makes it easier to control than the bicycle crunch and a good way to learn to rotate from your trunk.
Exercise details
- Muscle group
- Core
- Primary muscle
- Obliques
- Equipment
- Bodyweight
- Difficulty
- Beginner
- Type
- Isolation
How to perform it
- 1Lie on your back with your knees bent and feet flat on the floor.
- 2Place your fingertips lightly behind your ears, elbows pointing out.
- 3Breathe out and curl your head and shoulders off the floor, rotating to bring your right shoulder toward your left knee.
- 4At the same time, lift your left knee in toward your chest to meet it.
- 5Pause and squeeze for a second, then lower slowly back down.
- 6Repeat to the other side, or finish all reps on one side before switching.
Cross-Body Crunch form cues
- Lead with your shoulder, not your elbow — the twist comes from your ribs moving toward your hip.
- Keep your lower back pressed lightly into the floor.
- Breathe out as you crunch and twist; breathe in as you lower.
- Move slowly enough that you could stop at any point in the rep.
Common Cross-Body Crunch mistakes
Pulling on your head
Your hands only support your head. Keep a fist-sized gap between your chin and chest.
Only the elbow moves
Flapping the elbow across your face isn't a twist. Rotate the whole shoulder blade off the floor.
Going fast
Speed turns it into momentum. Take about three seconds per rep.
Who the Cross-Body Crunch is for
Beginners building core strength and anyone who wants direct oblique work without equipment. It pairs well with a plank or side plank in a short core finisher.
Cross-Body Crunch vs similar exercises
vs Air Bike
Both legs stay off the floor and you alternate sides continuously — harder, and faster paced. The cross-body crunch is the slower, more controlled version.
vs Russian Twist
Rotation while seated in a V position rather than lying down, often holding a weight.
How to program the Cross-Body Crunch
- Use the Cross-Body Crunch later in your workout as an accessory, after your main compound lifts.
- Warm up with one or two lighter sets before your working sets to prime the movement.
- As an isolation move, 3–4 sets of 10–15 reps works well, resting 45–75 seconds. Chase a strong contraction and controlled tempo over heavy weight.
- To progress, add reps, slow the lowering phase, or move to a harder variation once the current version feels easy.
Cross-Body Crunch alternatives
No space? These train the same obliques, grouped by what you have available.
Dumbbell or kettlebell
Machine or cable
Easier and harder variations
The Cross-Body Crunch is rated beginner. Regress while you build the pattern, progress once it feels easy.
Harder — progress from it
What to pair it with
For a balanced session, pair the Cross-Body Crunch with a move for the opposing muscles — the Captains Chair Straight Leg Raise (abs) or the Crunches (abs). Alternating the two as a superset saves time, because one side rests while the other works.
Where it fits in your weekly plan
When the free routine generator builds your week, the Cross-Body Crunch can land on:
- Full Body days — in 1–2 days a week plans
- Legs days — in 3, 5 or 6 days a week plans
- Lower Body days — in 4 or 5 days a week plans
Included when your equipment is set to: No equipment, Dumbbells, Full gym.
Free tools for this exercise
Put it in your plan
SSS Workout Assistant builds a custom weekly routine around your goals and adds moves like the Cross-Body Crunch automatically — then tracks every set.
Build my free planFrequently asked questions
How many cross-body crunches should I do?
2–3 sets of 10–15 slow reps per side is a good start. Add a pause at the top before adding reps.
What muscles does the Cross-Body Crunch work?
The Cross-Body Crunch primarily targets the obliques within the core muscle group.
What equipment do I need for the Cross-Body Crunch?
None — the Cross-Body Crunch is a bodyweight exercise you can do anywhere, no gym required.
Is the Cross-Body Crunch a compound or isolation exercise?
The Cross-Body Crunch is an isolation exercise, focusing work on a single muscle group. It's well suited to beginner trainees.
How many sets and reps of the Cross-Body Crunch should I do?
As an isolation move, 3–4 sets of 10–15 reps works well, resting 45–75 seconds. Chase a strong contraction and controlled tempo over heavy weight.
Is the Cross-Body Crunch good for beginners?
Yes — the Cross-Body Crunch is beginner-friendly. Start light, focus on clean technique, and add difficulty gradually as it becomes comfortable.
What can I do instead of the Cross-Body Crunch?
Good substitutes that train the same obliques include the Alternate Heel Touchers (bodyweight), the Band Pallof Press (band), the Dumbbell Side Bend (dumbbell). Pick the one that matches the equipment you have.
Can I do the Cross-Body Crunch at home?
Yes — it needs no equipment, so it works at home, in a hotel room, or anywhere you have a bit of space.
