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Core Bodyweight Beginner Video

How to do the Diagonal Crunch with Opposite Leg Extension

Primary: Obliques.

Targets obliques and deep core.

Demo video: Diagonal Crunch with Opposite Leg Extension · from the Fitbe exercise library Open in Fitbe →

Step by step

  1. 1

    Crunch toward opposite knee.

  2. 2

    Extend other leg out.

  3. 3

    Exhale on effort.

Coaching cues

  • Maintain proper form

Sets, reps and where it fits

Muscle

3–4 × 12–16

rest 60–90 s

Strength

not a strength lift

use for assistance

Fat loss

3 × 12–16

rest 45–60 s

Impact: low Knee stress: low Spine load: low Home-friendly

Diagonal Crunch with Opposite Leg Extension alternatives

Same movement pattern, different equipment or difficulty. Swap one-for-one in any plan.

Bicycle CrunchBodyweight · beginner Plank Shoulder TapBodyweight · beginner Russian TwistBodyweight · beginner Side PlankBodyweight · beginner Alternate Oblique CrunchBodyweight · beginner Bent-Knee Drive to Shoulder (From Back Position)Bodyweight · beginner

Frequently asked questions

What muscles does the Diagonal Crunch with Opposite Leg Extension work?

Primary: Obliques.

How many sets and reps of Diagonal Crunch with Opposite Leg Extension should I do?

For muscle: 3–4 sets of 12–16 reps. For strength on compound lifts: 4–5 sets of 4–6. Rest 60–120 seconds between sets.

What can I do instead of the Diagonal Crunch with Opposite Leg Extension?

Same movement pattern, different equipment: Bicycle Crunch, Plank Shoulder Tap, Russian Twist, Side Plank, Alternate Oblique Crunch, Bent-Knee Drive to Shoulder (From Back Position).

Is the Diagonal Crunch with Opposite Leg Extension good for beginners?

Yes. It is a beginner-friendly movement; start light, master the steps above and add load gradually.