All Exercises

Prisoner Half Sit-up

Strengthen your rectus abdominis and iliopsoas with the Prisoner Half Sit-up. This bodyweight core exercise enhances abdominal endurance and stability.

Intermediate
Compound
Pull
1 min per set30s rest

Description

A Prisoner Half Sit-up is a bodyweight exercise that targets the abs muscles. It is performed by lying on the back, with hands behind the head, and knees bent. The upper body is then raised half way, and lowered back down.

How to Do Prisoner Half Sit-up

  1. 1
    Setup

    Lie on your back with your knees bent, feet flat on the floor about hip-width apart, and heels a comfortable distance from your glutes.

  2. 2
    Setup

    Gently place your fingertips behind your head, keeping your elbows wide and pointed outwards throughout the movement.

  3. 3

    Exhale as you engage your core, slowly lifting your head, shoulders, and upper back off the floor.

  4. 4

    Continue lifting until your shoulder blades are just off the mat, ensuring your lower back remains pressed into the floor and you do not lift past a half sit-up.

  5. 5

    Inhale as you slowly and with control lower your torso back down to the starting position, maintaining tension in your abdominal muscles.

Tips

  • Focus on initiating the movement from your abdominal muscles, not by pulling on your neck with your hands.
  • Keep your elbows wide throughout the exercise to prevent neck strain and ensure proper chest and core engagement.
  • Control the eccentric (lowering) phase of the movement; a slow descent maximizes muscle activation and builds greater strength.
  • Maintain a neutral spine by keeping your lower back pressed into the floor to protect it and fully engage the rectus abdominis.

Common Mistakes

  • ×Pulling on your neck instead of engaging your abs can cause strain; fix this by keeping your hands light on your head and focusing on lifting with your core.
  • ×Lifting too high and disengaging your core reduces effectiveness; fix this by stopping when your shoulder blades are just off the floor, maintaining constant abdominal tension.
  • ×Rushing through repetitions diminishes muscle engagement; fix this by performing each repetition slowly and with control, especially on the way down.

Variations

Related Exercises

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