Straight Leg Sit-up

Master the straight leg sit-up, a core-strengthening exercise. Keep legs flat and straight to specifically target your abdominal muscles.

Intermediate
Compound
Pull
1 min per set30s rest

Description

A variation of the traditional sit-up where legs remain straight and flat on the floor, targeting the abdominal muscles specifically.

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How to Do Straight Leg Sit-up

  1. 1
    Setup

    Lie supine on the floor with your legs extended straight, feet together, and arms either extended overhead or crossed over your chest.

  2. 2
    Setup

    Actively engage your core, pressing your lower back into the floor to maintain a neutral spine and prevent arching.

  3. 3

    Exhale as you initiate the movement by contracting your rectus abdominis, rolling your torso up off the floor towards your knees.

  4. 4

    Continue to lift your torso until your chest is close to your thighs, ensuring your legs remain straight and your heels stay grounded.

  5. 5

    Inhale as you slowly and with control reverse the movement, articulating your spine segment by segment back down to the starting position.

Tips

  • Control the descent: Avoid flopping back down; control the eccentric phase to maximize muscle engagement and protect your spine.
  • Keep legs straight: Actively press your heels into the floor and engage your quadriceps throughout the entire movement to prevent your knees from bending.
  • Focus on core engagement: Initiate the movement from your abdominal muscles, not by yanking your neck or using excessive momentum from your arms.
  • Vary arm position: Crossing your arms over your chest increases difficulty, while extending them overhead can provide counter-leverage, making the exercise slightly easier.

Common Mistakes

  • ×Using momentum: Avoid swinging your arms or yanking your neck to get up; instead, focus on a slow, controlled abdominal contraction to lift your torso.
  • ×Lifting heels or bending knees: Keep your heels pressed firmly into the floor and your legs straight throughout the entire movement by engaging your quads and glutes.
  • ×Arching the lower back: Do not allow your lower back to arch excessively off the floor during the movement; maintain a slight posterior pelvic tilt by engaging your core.

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Frequently Asked Questions

What muscles does Straight Leg Sit-up work?
Straight Leg Sit-up primarily targets Iliopsoas, Rectus Abdominis. Secondary muscles include Obliques, Quadriceps, Sartorius, Tensor Fasciae Latae.
Is Straight Leg Sit-up good for beginners?
Straight Leg Sit-up is rated intermediate. Beginners can still attempt it with lighter weight and careful form, but it's best to master easier variations first.
What equipment do I need for Straight Leg Sit-up?
You need Body weight to perform Straight Leg Sit-up. If you don't have this equipment, look for variations that target the same muscles with what you have available.
What are the best tips for Straight Leg Sit-up?
Control the descent: Avoid flopping back down; control the eccentric phase to maximize muscle engagement and protect your spine. Keep legs straight: Actively press your heels into the floor and engage your quadriceps throughout the entire movement to prevent your knees from bending. Focus on core engagement: Initiate the movement from your abdominal muscles, not by yanking your neck or using excessive momentum from your arms. Vary arm position: Crossing your arms over your chest increases difficulty, while extending them overhead can provide counter-leverage, making the exercise slightly easier.
What are common mistakes when doing Straight Leg Sit-up?
Using momentum: Avoid swinging your arms or yanking your neck to get up; instead, focus on a slow, controlled abdominal contraction to lift your torso. Lifting heels or bending knees: Keep your heels pressed firmly into the floor and your legs straight throughout the entire movement by engaging your quads and glutes. Arching the lower back: Do not allow your lower back to arch excessively off the floor during the movement; maintain a slight posterior pelvic tilt by engaging your core.

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Straight Leg Sit-up

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