Leg Curl
Leg curl in the machine effectively isolates the hamstrings and develops knee flexion strength. The movement is suitable for both beginners and experienced individuals, and helps balance the strength levels of the front and back of the thigh. Perform at a controlled pace for the best results and to ensure knee health.
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Required equipment
Why Leg Curl?
Leg curl is an excellent exercise for effectively isolating and strengthening the hamstrings, the muscles at the back of the thighs. This movement is fundamental for strong and balanced legs and is an essential part of a diverse leg workout. With leg curls, you develop knee flexion strength, which is important for both athletic performance and daily activities. It also helps prevent injuries, especially around the knee area, when the strength ratios of the front and back thigh muscles are balanced. The movement is excellent for fitness enthusiasts of all levels – both beginners who are learning to engage their hamstrings and more experienced trainers who want to increase muscle mass and strength. Thanks to the leg curl machine, the movement is easy to control and focus purely on the target muscle. It is a great alternative to exercises like deadlifts and other compound movements or can be used to support them when you want to ensure maximum activation of the hamstrings without overloading the lower back or other stabilizing muscles. By performing leg curls at a controlled pace and focusing on the mind-muscle connection, you will achieve the best results and keep your knees healthy. Remember to adjust the machine correctly to fit your measurements so that the range of motion is optimal and you avoid unnecessary strain. Regularly incorporating leg curls into your workout program will help you build stronger, more balanced, and functional legs, supporting overall well-being and performance.
Benefits
Effectively strengthens the hamstrings.
Develops knee flexion strength.
Balances the muscles of the front and back of the thigh.
Prevents knee injuries by improving muscle balance.
Increases muscle mass and strength in the hamstrings.
Improves athletic performance and daily functionality.
Muscle groups
Primary
- hamstring10
- hamstring10
Secondary
- calves6
- calves6
Stabilizers
- gluteal3
- gluteal3
- abs2
- lower-back2
How to perform
Setup
- Adjust the ankle roll of the machine so that it sits just above the heel (at the top of the Achilles).
- Position the thigh pad or hip support firmly on the hips and ensure that the knee joint is in line with the pivot point of the machine.
- Select an appropriate resistance and take a light grip on the handles to stabilize your body in the prone position.
Execution
- Gently engage your core and keep your hips pressed against the bench throughout the movement.
- Flex your knees by pulling the ankle roll towards your glutes until you feel a strong contraction in your hamstrings without arching your lower back.
- Pause the movement momentarily at the top position and consciously squeeze your hamstrings (1-2 seconds).
Coaching cues
- •Move in a controlled manner: about 2 seconds up – 1 second hold – 2-3 seconds down.
- •Do not let your hips rise or your lower back arch; keep your core engaged at all times.
Common mistakes
❌ Too fast and jerky movement.
Why it's wrong: Performing the movement too quickly or jerkily utilizes more momentum than muscle strength, which reduces hamstring activation and increases the risk of injury.
✓ Fix: Focus on a controlled and steady movement both up and down. Hold a brief contraction at the top position.
❌ Lower back lifting off the bench or hips rising.
Why it's wrong: If the hips rise off the bench or the lower back lifts, the load shifts from the hamstrings to the lower back, which can cause back pain and reduce the effectiveness of the movement.
✓ Fix: Keep the hips firmly pressed against the bench throughout the movement. Engage your core and lightly squeeze your glutes.
❌ Insufficient range of motion.
Why it's wrong: A too short range of motion, where the knee does not flex enough or the weight is lowered too quickly, reduces the muscle's stretch and overall activation.
✓ Fix: Ensure a full range of motion where the knees flex as much as possible and the weight is lowered in a controlled manner to nearly straight (without locking).
Frequently asked questions
How often should I do leg curls?
You can do leg curls 1-3 times a week depending on the overall structure of your training program and your recovery ability. If you are doing other leg exercises, such as squats and deadlifts, 1-2 times may be sufficient. Listen to your body and ensure adequate recovery.
Can I do leg curls at home without a machine?
Yes, you can simulate leg curls at home using a resistance band or a towel, having a partner hold your legs, or performing Nordic Hamstring Curls. However, these do not isolate the muscle in quite the same way as the machine.
Why should I include leg curls in my training program?
It helps balance the leg musculature by strengthening the hamstrings, which often receive less attention compared to the quadriceps. This prevents injuries, improves athletic performance, and promotes aesthetic muscle balance.
Does the movement feel more in the calves than in the hamstrings?
If you primarily feel the movement in your calves, it may be due to excessive ankle flexion or incorrect machine settings. Try keeping your ankle in a more neutral position or slightly flexed and focus on squeezing your hamstrings. Also, check the machine adjustments.
Safety tips
- Always adjust the machine to your own measurements before starting the movement.
- Start with a light weight and focus first on proper technique.
- Avoid hyperextending the knees in the bottom position of the movement.
- Keep the movement controlled and avoid jerking or swinging.
- Listen to your body and stop if you feel pain in your knees or lower back.
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