Exercise · form guide
Machine Crunch
- Primary muscle
- Rectus Abdominis
- Also works
- Obliques
- Equipment
- Selectorized Crunch Machine
- Difficulty
- Beginner
Tempo
1-2-2-1
Easier to load progressively than cable crunches and removes the kneeling fatigue. Same principle: crunch from ribs to hips.
Sets & reps
General programming defaults by goal — not specific to this lift. Pick the row that matches yours.
| Goal | Sets | Reps | RPE | Rest |
|---|---|---|---|---|
| Strength | 4–6 | 3–5 | 8–9 | 3–5 min |
| Hypertrophy | 3–5 | 8–12 | 7–9 | 90–120 s |
| Endurance | 2–4 | 15–25 | 6–8 | 45–60 s |
Form
Cues
- Seat so the pad sits on upper chest
- Round spine — flexion comes from the ribs, not the hips
- Squeeze 2s at full crunch
- Slow eccentric
Common mistakes
- Hip-hinging instead of spinal flexion
Injury notes
Avoid with disc-bulge history. Use bird-dog/dead bug.
Progression
Add 2.5kg/stack when 15 strict reps land easy.
Indian gym reality
Machines vary wildly across Indian gyms — the same exercise on a different brand can feel completely different. Trust the movement pattern and target muscle, not the sticker on the machine.
If your gym doesn't have this equipment
- Use the free-weight version of the same pattern; the machine's guidance is convenience, not necessity.
Home & hostel version
Bodyweight variants of this movement pattern exist — search the pattern name (squat, hinge, press, pull) plus 'bodyweight' and pick the version that matches your current strength.
Nutrition & recovery around this lift
Isolations recover fast — 24 hours is usually enough. You can hit the same muscle again the next day with a different exercise. For an Indian lifter, land 30–40g of protein within 90 minutes of finishing — 200g paneer, 4 whole eggs, 150g chicken, or a whey shake all work.
Frequently asked
What muscles does Machine Crunch work?
Primarily Rectus Abdominis · Obliques. Load and rep range shift the emphasis — heavy triples bias the primary mover, sets of 12+ bring more of the secondaries in.
How many sets of Machine Crunch per week?
For hypertrophy, 10–20 direct working sets per week across all exercises for that muscle. This exercise usually contributes 3–8 of those sets, depending on where it sits in your program.
My Indian gym doesn't have this machine — what do I do?
See the "If your gym doesn't have this equipment" section above — every variant listed is a legitimate substitute, not a compromise.
How often should I do Machine Crunch?
Most intermediates do best with 2× per week frequency on any given lift — one heavier session and one lighter, or two matched sessions with different rep ranges. Beginners can add a third if recovery holds up.
Get Machine Crunch programmed for you
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