LIONSCOOL Leg Extension and Curl Machine V4.0
Trusted by 3000+ Fitness Enthusiasts
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Lionscool Leg Extension is engineered for serious leg training at home — silent, sturdy, and built to last. With the Leg Extension, you’ll enjoy the same leg training quality at home, without commuting, crowds, or time limits.
After just 6 months, it practically pays for itself.
Lionscool offers a 2-year limited warranty covering all structural and functional components under normal use. For warranty support, please contact our customer service team to keep your equipment performing at its best.
Overview
Ultra-Smooth Motion Pulley System
Upgraded from plastic to aluminum for smoother, quieter motion and improved longevity.
Beyond 1:1 Resistance
Experience a >1:1 power ratio that amplifies your plates, delivering a true challenge without the wasted weight common in lesser designs.
Heavy-Duty Steel Frame
Made with thick 6-gauge steel for better stability and long-term durability—especially compared to typical home gym frames.
Effortless Adjustability and Accessibility
With a 6-position adjustable backrest and a 9-angle selector with a self-adjusting roller, you'll achieve a truly expansive and personalized range of motion for every single workout.
Leg Extension V4 Review
Product specification
- Lifetime Technical Support
- 2-Year Frame Warranty: Covers structural steel and welds.
- 1-Year Parts Warranty: Includes wear and tear parts like pulleys and cables.
43"W x 57"D / 65"D(Laid Down) x 40"H
125LBS
5.09'' - 6'23''
600LBS
500LBS
2 Packages
The Lionscool Leg Extension and Curl Machine V4.0 stands out with its fortified structure and advanced features. You'll experience superior stability and performance during every session.
- Robust and Durable Construction: Built with heavy-duty steel, it supports up to 600 lbs of plate loading capacity and an impressive 1100 lbs of user capacity.
- Smooth Cable Pulley System: Enjoy consistent resistance, unlike traditional lever machines. This unique system helps with muscle growth and definition.
- Upgraded Technique: The weight arm connects with an upgraded technique, combined with a strong aluminum pulley and reinforced 8mm-thick cable.
- Compact Dimensions: Assembled upright, it measures 43” width x 57” depth x 40” height. Laid down, its depth is 65”.
- Reliable Warranty: Includes a 2-year frame warranty (structural steel & welds) and a 1-year warranty on other parts.
Shipping Note: Please note that it ships in two packages and may arrive separately.
Customer Reviews
I’ve had this piece of equipment for about 4 months now and I absolutely love it! The smooth motion and strength curve is exactly what I was looking for. I love the adjustability it offers for multiple sized people. I am 6’2” 220 pounds and I have plenty of room on this machine. The pads are surprisingly comfortable. The vinyl is cheap but the pads are stiff enough not to cause discomfort. The finish they use on the machine is not the best and the welds look pretty rough but I believe they will hold just fine. I have loaded a lot of weight on this machine and it handles it just fine. The back rest has a lot of play in it but when you are using the machine it feels solid. My BIGGEST complaint is that the bar for the leg roller is crooked so your legs are not even when performing the exercise. I attached a picture to show what I’m talking about. I don’t know if mine is the only one like that because I received one of the first V4 or if they all come that way. Other than that this thing is amazing and 100% worth the money! I highly recommend this for any home gym!
Update: Nick from their customer service reached out to me and sent me a replacement part for the movement arm and now everything is straight and level! See updated picture. Great company and great service!
Leg extension is crooked on right side down about 3/4”. Replacement part was sent and still crooked. Otherwise very solid machine. Just wish the leg pad was straight. Very important for leg development evenly
Nick in customer service that I’ve been talking to is very professional and seemed to care about my complaints
UPDATE— Lionscool sent me another part that completely eliminated the problem. Leg part is no longer crooked. They are a 5 star company. They didn’t have to fix the part but they did because they truly care about the customer. I am so impressed by their service. Rest assured that they will take care of any problems if they arise. Also the machine is great. Smooth as any leg extension I’ve ever used. Highly recommend!!
I received the shipment in a reasonable amount of time. It came in two boxes a day apart. The second box had two holes in it and after opening it I discovered that the packet that held the nuts and bolts had broken open. I sorted what I gathered thanks to a handy guide in the instruction sheet and put it together. IThe instructions were pertty straight forward and it wasn't too difficult.
It turned out I was only missing three bolts, a nut, and a couple of washers. I emailed customer service that night, after hours, and received a response that night from Nick who stated he would ship the hardware, and a few extra pieces right away. I received them about a week later. I'm very happy with the machine and satisfied with the customer service response.
The fact that this is the best budget leg extension / curl machine on the market, is undisputed at this point. By the way, I love the resistance profile of this one: it's at its heaviest in the start of the rep, when your muscle is stretched at its maximum. Just see what the Garage Gym Review guy had to say about it https://youtu.be/rh1FFej0Wyo
What I want to point out is that this machine should be a priority before you even consider a functional trainer or any other machine in your gym. As far as machines go, you shouldn't buy any other machine before getting your leg extension / curl.
Assume you have your basics: barbell, weights, adjustable dumbbells, squat rack with high/low pulley and adjustable bench.
This leg extension / curl machine should be the VERY next thing you get. There aren't any barbell or dumbbell exercises that can mimic the leg extension and curl, so there's nothing else but a machine. And these exercises are tier 1, so in terms of adding quality exercises to your program...you can't do much better than this.
99% of the exercises you do on a functional trainer you can do with the high/low pulley on your squat rack attachment, so it's this leg machine before you even think about a functional trainer.
Incomplete hardware kit, box was ripped to shreds and cant complete the build. Reached out to customer service fir the parts and was told they'd be in touch with the tracking info for replacement parts...3 days and nothing. We'll be going for the refundthis week
We are so sorry for the frustrating experience you had with your order. Our team shipped the replacement parts on Friday, but unfortunately, due to the weekend, we were unable to update the tracking information right away. We apologize for that delay in communication. We have now updated the tracking information for your replacement parts, and you should be able to track the package.
We take your feedback on the packaging seriously and have already improved the packaging for our Leg Extension machine. We've added more foam and an extra layer of cardboard to secure the hardware kit, which should prevent the issue of loose screws from happening in the future.The hardware kit is now more secure, so this issue should not happen again.
We apologize again for the inconvenience and appreciate your patience.
FAQ
What is the difference between Lionscool V3 and V4?
The V4 brings significant improvements over the V3 for enhanced stability, durability, and user experience:
Reduced Gaps and Tolerances: We've minimized the gaps between components, creating a tighter connection for superior stability and equal tension on both legs.
Strengthened Weight Arm Junction and Balanced Weight Horn Design: The connection between the weight arm and frame is reinforced for enhanced durability and lifetime alignment stability. The weight horn is now a dual-sided design, effectively preventing weight plate slippage during use.
Upgraded Aluminum Pulley: The pulley has been upgraded to a durable aluminum one, ensuring lifetime longevity.
More Flexible Adjustment: The V4 features 9 adjustment positions on the cam (compared to 7 on the V3). The foot roller can now be freely rotated to adjust its orientation inward or outward and then fixed with a peg for personalized comfort.
Fit for Taller Users: We've lengthened the movement arm and foot roller frame to ensure the foot roller pad comfortably conforms to the ankles of taller individuals.
Enlarged Base: The rectangular base is enlarged with extended rear feet, significantly increasing overall stability.
What muscles do leg extensions work?
The leg extension is an isolation exercise that specifically targets the quadriceps femoris, the large muscle group at the front of your thigh. This group is composed of four distinct muscles: the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius. All four of these muscles work together to perform knee extension, which is the primary movement of this exercise, making it highly effective for building strength and definition in your quads.
Are leg extensions bad for knees?
Using the Lionscool Leg Extension is a highly effective way to isolate and strengthen the quadriceps muscles at the front of your thighs. We understand the common concern regarding knee safety. When performed correctly, the leg extension is a safe exercise. The key is to select an appropriate weight and to avoid using momentum or jerky motions. At the peak of the movement, keep your knees slightly bent instead of fully locking them to ensure the tension remains on your muscles, not your joints. By focusing on slow, controlled movements, you can effectively build quadriceps strength. Stronger quads actually contribute to greater knee stability, which helps protect the joint. If you have a history of knee injuries, we recommend consulting with a doctor or physical therapist before use.
What is the warranty policy?
We offer a 2-year warranty on core components and lifetime technical support. In case of a faulty component, we commit to a 24-hour response time for replacement part shipment.
What should I do if a component is damaged?
Should you encounter any quality issues, we're here to help. For example, in a recent case, customer A received a free replacement for a damaged component. Please refer to our service flow chart for the detailed process.
FAQ
What is the difference between Lionscool V3 and V4?
The V4 brings significant improvements over the V3 for enhanced stability, durability, and user experience:
Reduced Gaps and Tolerances: We've minimized the gaps between components, creating a tighter connection for superior stability and equal tension on both legs.
Strengthened Weight Arm Junction and Balanced Weight Horn Design: The connection between the weight arm and frame is reinforced for enhanced durability and lifetime alignment stability. The weight horn is now a dual-sided design, effectively preventing weight plate slippage during use.
Upgraded Aluminum Pulley: The pulley has been upgraded to a durable aluminum one, ensuring lifetime longevity.
More Flexible Adjustment: The V4 features 9 adjustment positions on the cam (compared to 7 on the V3). The foot roller can now be freely rotated to adjust its orientation inward or outward and then fixed with a peg for personalized comfort.
Fit for Taller Users: We've lengthened the movement arm and foot roller frame to ensure the foot roller pad comfortably conforms to the ankles of taller individuals.
Enlarged Base: The rectangular base is enlarged with extended rear feet, significantly increasing overall stability.
What muscles do leg extensions work?
The leg extension is an isolation exercise that specifically targets the quadriceps femoris, the large muscle group at the front of your thigh. This group is composed of four distinct muscles: the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius. All four of these muscles work together to perform knee extension, which is the primary movement of this exercise, making it highly effective for building strength and definition in your quads.
Are leg extensions bad for knees?
Using the Lionscool Leg Extension is a highly effective way to isolate and strengthen the quadriceps muscles at the front of your thighs. We understand the common concern regarding knee safety. When performed correctly, the leg extension is a safe exercise. The key is to select an appropriate weight and to avoid using momentum or jerky motions. At the peak of the movement, keep your knees slightly bent instead of fully locking them to ensure the tension remains on your muscles, not your joints. By focusing on slow, controlled movements, you can effectively build quadriceps strength. Stronger quads actually contribute to greater knee stability, which helps protect the joint. If you have a history of knee injuries, we recommend consulting with a doctor or physical therapist before use.
What is the warranty policy?
We offer a 2-year warranty on core components and lifetime technical support. In case of a faulty component, we commit to a 24-hour response time for replacement part shipment.
What should I do if a component is damaged?
Should you encounter any quality issues, we're here to help. For example, in a recent case, customer A received a free replacement for a damaged component. Please refer to our service flow chart for the detailed process.