---
title: "Crunch (Straight Leg Up)"
description: "Begin by lying flat on your back with your legs extended straight up towards the ceiling."
locale: en
slug: crunch-straight-leg-up
url: "https://hi.fitness/exercises/crunch-straight-leg-up"
primaryMuscle: "Core"
secondaryMuscles: ["Quads"]
equipment: ["Bodyweight"]
category: "Strength"
format: "Reps"
video: "https://hi.fitness/exercise-media/public/video/51f98255-crunch-straight-leg-up.mp4"
updatedAt: 2026-10-20T13:27:27+00:00
---
# Crunch (Straight Leg Up)

Begin by lying flat on your back with your legs extended straight up towards the ceiling.

## How to do it

1. Begin by lying flat on your back with your legs extended straight up towards the ceiling. Keep your feet together, and your arms extended straight above your chest.
2. Engage your core and lift your shoulder blades off the floor, reaching your arms towards your toes.
3. Hold the crunch position briefly, squeezing your abdominal muscles at the top.
4. Lower your shoulder blades back to the floor with control, keeping your legs extended upward. Repeat the movement for the desired number of repetitions.

## Form tips

- Avoid using your neck or momentum to lift your shoulders; focus on using your abdominal muscles.
- Use a mat or soft surface to support your back and prevent discomfort during the exercise.
- Breathe steadily throughout the exercise, exhaling as you lift your shoulders and inhaling as you lower them.
- Ensure your lower back remains pressed into the floor to avoid unnecessary strain.

## Similar exercises

- [Hanging Knee Raises](https://hi.fitness/exercises/hanging-knee-raises) - Core · Pull-up bar
- [Ab Wheel All the Way Out](https://hi.fitness/exercises/ab-wheel-all-the-way-out) - Core · Ab wheel
- [Captain's Chair Knee Raise](https://hi.fitness/exercises/captains-chair-leg-raise) - Core · Roman chair
- [Decline Sit Up](https://hi.fitness/exercises/decline-sit-up) - Core · Bench
- [Leg Raises (Straight Legs)](https://hi.fitness/exercises/leg-raises-straight-legs) - Core · Roman chair
- [Russian Twist Weighted Ball](https://hi.fitness/exercises/russian-twist-weighted-ball) - Core · Medicine ball
- [Crunch with Medicine Ball](https://hi.fitness/exercises/crunch-with-medicine-ball) - Core · Medicine ball
- [Crunch (On Stability Ball)](https://hi.fitness/exercises/crunch-on-stability-ball) - Core · Stability ball