Stop Doing Hamstring curls without an Omnistrap! - The Nordstick

Stop Doing Hamstring Curls Without an Omnistrap!

In the smarter knee extensions blog, we discussed basic biomechanics and focused on how using the Omnistrap lengthens the moment arm during the knee extension exercise. Now, let's turn our attention back to the hamstrings and show how the Omnistrap is an effective hamstring strengthening tool, offering some advantages over other options.

Understanding Biomechanics

As a quick review…

Torque = Force x Moment Arm

This concept underpins pretty much all of biomechanics. The moment arm is the distance between the force application point and the axis of rotation. Technically, it is the perpendicular distance, which means it changes as a joint goes through a range of motion. To illustrate this point, see the pictures below:

The dotted lines in these examples represent the moment arms. You can see how, the higher up in the prone hamstring curl you get, the smaller the moment arm gets for the hamstring. This means the muscle has less leverage the higher the weight is curled. Additionally, you can see how, due to positioning, after a certain point gravity starts to help push the foot attachment down.

Benefits of Using the Omnistrap for Hamstring Curls

  1. Increased Resistance Throughout the Range of Motion:

    • Unlike prone hamstring curls, standing hamstring curls with the Omnistrap ensure that the moment arm for the hamstring gets larger the higher the weight is curled.
    • Gravity constantly opposes the movement, providing consistent resistance throughout the exercise.
  2. Improved Muscle Engagement:

    • The leg is free to rotate during standing hamstring curls, which means the hip muscles have to work to prevent that rotation and rotation around the knee.
    • The hamstrings are responsible for controlling the rotation of the knee joint, leading to better overall muscle engagement and strengthening.

Latest Research on Hamstring Curls

Recent studies have highlighted several benefits of hamstring curls, especially when performed with the right equipment:

  • Enhanced Muscle Activation: According to a study published in the Journal of Strength and Conditioning Research, exercises that maximize the moment arm, such as standing hamstring curls, result in greater muscle activation compared to prone curls .

  • Injury Prevention: Strengthening the hamstrings is crucial for preventing injuries, particularly in athletes. A study from the American Journal of Sports Medicine found that hamstring strength training significantly reduces the risk of hamstring strains .

  • Functional Strength: Hamstring curls improve functional strength, which is essential for various daily activities and sports performance. The Omnistrap enhances this by providing a full range of motion and consistent resistance .


Using the Omnistrap for hamstring curls offers significant advantages over traditional prone curls. By increasing resistance throughout the range of motion and improving muscle engagement, the Omnistrap helps you achieve better results. Incorporate this tool into your routine to maximize the benefits of your hamstring workouts.


  1. Journal of Strength and Conditioning Research
  2. ResearchGate: Muscle Activation
  3. American Journal of Sports Medicine
  4. Functional Strength Training
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