What muscles does the Straight Leg Up Crunch work?

The Straight Leg Up Crunch primarily targets the upper abdominal muscles, while also engaging the lower abs and obliques for stability. Keeping your legs straight and elevated increases the challenge and helps activate the core more effectively.

Do I need any equipment for the Straight Leg Up Crunch?

This is a bodyweight exercise, so no equipment is necessary just a comfortable space or a yoga mat. If preferred, you can hold a small weight or medicine ball for added resistance once you have mastered the basic form.

Is the Straight Leg Up Crunch suitable for beginners?

Beginners can start with bent knees instead of fully extended legs to reduce strain on the lower back. It’s important to focus on correct form before increasing difficulty to avoid injury and maximize results.

What are common mistakes to avoid when doing Straight Leg Up Crunches?

Common errors include pulling on the neck, letting the legs drop, and using momentum instead of core engagement. Keep your chin slightly tucked, legs stationary, and move slowly to ensure proper muscle activation.

How many sets and reps should I do for the Straight Leg Up Crunch?

Aim for 2–3 sets of 12–20 reps depending on your fitness level. Advanced users can increase reps or add a small load for progression, while beginners should focus on controlled movements over high repetitions.

Are Straight Leg Up Crunches safe for people with lower back issues?

If you have a history of lower back pain, use caution and consult a healthcare professional before trying this exercise. Modifying by bending the knees or performing a basic crunch can reduce strain while still engaging the core.

What variations can I try to make the Straight Leg Up Crunch more challenging?

You can add a twist at the top to target the obliques or hold a weight plate toward your toes for increased resistance. Performing the exercise slowly or pausing at the peak also intensifies muscle engagement.

Straight Leg Up Crunch

Target Muscles

Primary:

Upper Abs

Secondary:

Lower Abs

Obliques

Equipment Required

Bodyweight

Exercise Type

Reps Only

How To Do

Lie on your back with your legs straight and extended upward, arms reaching toward your toes. Engage your core and lift your upper back and shoulders off the ground, reaching your hands toward your toes while keeping your legs stationary. Pause briefly at the top, then lower back down without letting your shoulders fully rest on the floor.

Step-by-Step Instructions

Lie flat on your back on a mat or comfortable surface, keeping your legs straight and extended upward, perpendicular to the floor.
Place your arms straight up, reaching toward your toes.
Engage your core muscles by tightening your abdominal area.
Slowly lift your upper back and shoulders off the ground, reaching your hands toward your toes. Keep your legs stationary and straight throughout the movement.
Pause briefly at the top of the movement, ensuring your abs are fully contracted.
Slowly lower your upper back and shoulders back to the starting position without letting them rest completely on the ground.
Repeat the movement for the desired number of repetitions.

Explore more upper abs exercises or bodyweight exercises in our exercise library.

Alternative Exercises

Floor Crunch

Upper Abs

Bodyweight

Crunch (Leg Raise)

Upper Abs

Lower Abs

Bodyweight

Kettlebell Sit-up

Abs

Upper Abs

Kettlebell

Otis Up

Abs

Upper Abs

Weight Plate • Bodyweight

Frequently Asked Questions

What muscles does the Straight Leg Up Crunch work?: The Straight Leg Up Crunch primarily targets the upper abdominal muscles, while also engaging the lower abs and obliques for stability. Keeping your legs straight and elevated increases the challenge and helps activate the core more effectively.
Do I need any equipment for the Straight Leg Up Crunch?: This is a bodyweight exercise, so no equipment is necessary just a comfortable space or a yoga mat. If preferred, you can hold a small weight or medicine ball for added resistance once you have mastered the basic form.
Is the Straight Leg Up Crunch suitable for beginners?: Beginners can start with bent knees instead of fully extended legs to reduce strain on the lower back. It’s important to focus on correct form before increasing difficulty to avoid injury and maximize results.
What are common mistakes to avoid when doing Straight Leg Up Crunches?: Common errors include pulling on the neck, letting the legs drop, and using momentum instead of core engagement. Keep your chin slightly tucked, legs stationary, and move slowly to ensure proper muscle activation.
How many sets and reps should I do for the Straight Leg Up Crunch?: Aim for 2–3 sets of 12–20 reps depending on your fitness level. Advanced users can increase reps or add a small load for progression, while beginners should focus on controlled movements over high repetitions.
Are Straight Leg Up Crunches safe for people with lower back issues?: If you have a history of lower back pain, use caution and consult a healthcare professional before trying this exercise. Modifying by bending the knees or performing a basic crunch can reduce strain while still engaging the core.
What variations can I try to make the Straight Leg Up Crunch more challenging?: You can add a twist at the top to target the obliques or hold a weight plate toward your toes for increased resistance. Performing the exercise slowly or pausing at the peak also intensifies muscle engagement.