Oblique Crunches
A beginner isolation movement that trains the abdominals with just bodyweight.
Force Type
Pull
direction of effort
Difficulty
Beginner
training level
Variations
0
equipment swaps
Muscles
1
primary + secondary
The verdict
Oblique Crunches has 7-step instructions, among the most thoroughly documented of the 93 abdominals exercises PlainExercise catalogues.
Ranked against the 93 abdominals exercises PlainExercise currently catalogues, not the full exercise-science literature.
Catalog lens
Two ways this record sits in the source corpus
These are placement measures for the documented record, not a score for exercise quality, safety, or suitability.
Instruction steps
#37 of 868
Most thoroughly documented
Numbered source steps, ranked across every documented exercise.
Instruction text
#113 of 868
More thorough than most
A separate character-length placement prevents step count from standing in for explanatory detail.
Oblique Crunches vs every catalogued exercise by instruction-text length
Where this record's instruction-character count sits among all 873 Free Exercise DB exercises with instructions, not a rating of the movement itself.
1,004 113th of 873 higher than 759 of 873 exercises
All exercises, banded by instruction-text character count
Each bar is a band; taller bars hold more exercises. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source Free Exercise DB · 2026-07-10
Oblique Crunches is documented from the Free Exercise DB (CC0) extract, last ingested July 2026. Classification, muscle roles and instruction text are source facts; the placement and cohort measures on this page are computed by PlainExercise and are not a rating of the movement.
What the Oblique Crunches Data Reveals · DEEP · PULL/ISOLATION
Oblique Crunches stands out on mechanic class: joint involvement separates this page from isolation peers.
Longer step lists usually mean finer setup cues, not a harder movement by themselves.
Across 93 catalogued abdominals movements, the average instruction record is 645 characters and 4.7 steps; 68 of those (73.1%) clear the same ≥500-character rich bar used here. This page ranks #6 of 93 by instruction-character length (1.56× the cohort average).
Among the 111 exercises that also use just bodyweight, average instruction length is 581 characters; 6 of those peers are longer than this record. Equipment-matched peers are the honest comparison when you are choosing a substitute implement for the same pattern.
Other well-documented abdominals movements (same ≥500-character bar):
- Bosu Ball Cable Crunch With Side Bends (10 steps, 1,219 chars)
- Pallof Press With Rotation (9 steps, 1,113 chars)
- Exercise Ball Crunch (5 steps, 1,097 chars)
- Crunches (6 steps, 1,082 chars)
- Crunch - Legs On Exercise Ball (7 steps, 1,024 chars)
Context matters: taxonomy (level, mechanic, force, musculature, equipment) does not account for individual biomechanics, joint history, or recovery. Common-mistake framing below is derived from classification fields, not case-specific coaching. Not medical or personal-training advice. Consult a physician or certified trainer before starting, especially with injuries, cardiovascular conditions, recent surgery, or pregnancy.
Oblique Crunches catalog footprint
Among 93 exercises whose primary muscle is abdominals, Oblique Crunches ranks #12 by catalogued variation count. The upstream file attaches 2 images to this slug. See the step-count ranking for abdominals for peer documentation depth.
Muscles worked
The Free Exercise DB classifies each muscle as primary or secondary. It does not measure activation, so we show involvement, not percentages.
Source: Free Exercise DB primary/secondary muscle classification. Actual recruitment varies by load and form.
Intensity context
For reference, here is where common activities sit on the MET intensity scale. Oblique Crunches does not have a measured MET in the source data, its intensity depends on the load and effort you use. Estimate calories for any activity with the calorie calculator.
MET values from the Compendium of Physical Activities (Ainsworth et al., 2011). A general reference scale, not a rating of this specific movement.
How to do it
- Lie flat on the floor with your lower back pressed to the ground. For this exercise, you will need to put one hand beside your head and the other to the side against the floor.
- Make sure your feet are elevated and resting on a flat surface.
- Now lift the shoulder in which your hand is touching your head.
- Simply elevate your shoulder and body upward until you touch your knee. For example, if you have your right hand besides your head, then you want to elevate your body upwards until your right elbow touches your left knee. The same variation can be applied doing the inverse and using your left elbow to touch your right knee.
- After your knee touches your elbow, lower your body until you have reached the starting position.
- Remember to breathe in during the eccentric (lowering) part of the exercise and to breathe out during the concentric (upward) part of the exercise.
- Continue alternating in this manner until all of the recommended repetitions for each side have been completed.
Common mistakes
- Rushing through reps before the pattern is grooved - at this stage, a slow, controlled tempo (2-3s down, 1-2s up) on Oblique Crunches teaches the nervous system the movement far faster than speed does.
- Cutting the range of motion short - moving the abdominals through its full safe range on Oblique Crunches is what most reliably separates effective reps from wasted ones.
- Using momentum instead of muscle, isolation movements like Oblique Crunches reward strict form. If you're swinging the weight, it's too heavy.
- Shrugging the shoulders up toward the ears on pull movements, keep shoulder blades down and back to load the correct muscles.
- Breathing out of sync with the lift on Oblique Crunches - brace and inhale during the lowering phase, exhale on the exertion, especially important with just bodyweight where control matters most.
Who this is for
- People new to resistance training who want to build a foundation in the movement pattern
- People who want to train the Abdominals
- People training at home without equipment
Who this is NOT for
- People hunting equipment swaps, this record has none to offer; browse the peer abdominals exercises for alternate patterns instead.
- Anyone with acute pain in the joints or muscles involved, pain is a stop signal, not a soreness signal
- People with unresolved injuries in the loaded joints, seek clearance from a physical therapist first
- Anyone with a recent surgery, cardiovascular limitation, or pregnancy complication without physician clearance
Progression path
Once Oblique Crunches feels comfortable with your current load, progress by (a) adding reps until you can complete 12+ per set, (b) increasing resistance by 2.5-5%, (c) moving to harder variations such as single-limb or longer lever versions, and eventually (d) stepping up to intermediate-level movements that train the same muscle.
See the Progression guide for a full framework on when to advance, and the Compound vs Isolation guide to decide when to prioritize this movement in your program.
Safety notes · BODY-ONLY · PULL/ISOLATION · FLOOR
- On PULL/ISOLATION abdominals work, warm up 5–10 minutes before loading Oblique Crunches; keep first sets light until the path feels automatic.
- Sharp or joint pain is a stop signal. Muscle soreness during sets is normal; pain is not.
- Beginners on BODY-ONLY gear: cut volume before cutting form, drop a set rather than rush reps.
- General information only. Consult a physician or certified trainer before starting any new exercise program.
Curated workout appearances
Oblique Crunches is not currently featured in one of the 186 curated workout routines on this site.
Nationwide exercises with similar documentation depth
Two Free Exercise DB peer sets for Oblique Crunches, drawn across all muscles (not the abdominals-only related list below). Each metric produces a different neighborhood.
Similar instruction step count
Nearest catalog records by numbered steps.
Similar instruction text length
Nearest catalog records by upstream instruction characters.
Related exercises
Other exercises that target the Abdominals.
See all Abdominals exercises.
Using the oblique crunches
Three ways to put it to work.
- Train the abdominals 2–3 times a week with 48+ hours between hard sets; pair this with other abdominals movements for balanced development. All abdominals exercises
- Match the load and rep range to your goal, strength, size, or endurance each call for a different scheme. Strength vs hypertrophy
- As an isolation movement, use it to target the abdominals directly after your compound lifts. Compound vs isolation
Form before load. If a movement causes sharp or joint pain, stop and substitute a safer alternative, this is general information, not medical or training advice.