A300 Leg Extension Pro

Model 1133

MAXIMIZE QUAD RESULTS

The quadriceps can produce very high forces at very fast speeds. That leaves the knee vulnerable to injury at high degrees of flexion. This machine lowers the resistance where the knee is most vulnerable to injury. Unlike conventional machines that use iron, the A300 Leg Extension Pro’s low‑inertia design gives you a smooth resistance. The result is a workout unlike anything else on the market. 

Show More

The quadriceps can produce very high forces at very fast speeds. That leaves the knee vulnerable to injury at high degrees of flexion. This machine lowers the resistance where the knee is most vulnerable to injury. Unlike conventional machines that use iron, the A300 Leg Extension Pro’s low‑inertia design gives you a smooth resistance. The result is a workout unlike anything else on the market. 

Get Pricing

Features you won’t find in conventional machines

  • Unilateral movement means each limb can be trained symmetrically

  • Large digital display that shows resistance, sets, repetitions, and peak power

  • Thumb buttons let you change resistance without changing position — even during exercise

  • Fast, easy, and precise eccentric overloading

  • Change resistance in increments as small as one pound

  • Industry-leading lifespan and uptime for years of use

  • Unique versatility; five ways to train instead of only one

  • Fully adjustable to accommodate a wide range of users

Show More
  • Unilateral movement means each limb can be trained symmetrically

  • Large digital display that shows resistance, sets, repetitions, and peak power

  • Thumb buttons let you change resistance without changing position — even during exercise

  • Fast, easy, and precise eccentric overloading

  • Change resistance in increments as small as one pound

  • Industry-leading lifespan and uptime for years of use

  • Unique versatility; five ways to train instead of only one

  • Fully adjustable to accommodate a wide range of users

COMMERCIAL-GRADE WARRANTY

We proudly stand behind the workmanship of our machines

MADE IN THE USA

with domestically and globally sourced materials

Why choose the A300 Leg Extension Pro?

plus
Lower risk of injury. Pain-free range of motion.
plus
Achieve your training goals faster
plus
Train at any speed — unlike conventional equipment
plus
Unmatched versatility to achieve any goal

Control Resistance With Digital Convenience And Precision

THUMB BUTTON CONTROLS

Thumb button controls on handgrips let you change resistance without changing position.

Change resistance during exercise without stopping.

Convenient resistance controls are perfect for quick, precise, eccentric overloading.

POWER DISPLAY

Get instant feedback for testing and evaluation. The Power Display shows:

  • Resistance level in (lbs. or kg)
  • Sets
  • Repetitions
  • Peak power produced on each repetition
  • Percentage of peak power
  • Adjustment positions

Six-repetition Peak Power test calculates the resistance at which you achieve maximum power. Clear, one-inch numbers can be seen from a distance.

CHIP SYSTEM AND INTEGRATED TECHNOLOGY

Your electric workout card remembers and displays your previous workout:

  • Resistance 
  • Sets
  • Reps
  • Adjustment Positions

Use Keiser Chip System with the Keiser Integrated Technology to download your workout on your phone, tablet, or computer.

Clear Advantages for your Business

Health Clubs

Attract more members and improve retention with more ways to train.

Learn more

Sports Performance

Strength at speed: Train explosive movement more safely.

Learn more

Medical Rehab

More visits, better outcomes, improved patient experience.

Learn more

Older Adult

Keiser works for every level of fitness and will make your facility stand out.

Learn more

Questions? Talk to a performance coach.

Mac Calloway,
Human Performance and Education Specialist

Our pros know what you need and can explain our strength machines in terms that make sense to professionals like you (USA and Canada only).

Set up a Conversation

TRY KEISER STRENGTH FOR YOURSELF

One of our Demo Vans will bring two of our strength machines to any location in Mainland UK and Scottish Highlands. And we’ll bring other machines from our functional, racks, and cardio lines for you to try.

Specifications

Lightweight

Easy to move when you need to change your floorplan. Place machines in locations where weight may be a concern (mezzanines, cruise ships, etc.).

Compact Footprint

Helps you make the most of your available floorspace.

Download full product sheet

A) WIDTH: 39”/991 MM

B) HEIGHT: 45”/1143 MM

C) DEPTH: 40”/1016 MM

WEIGHT: 150 LBS/68 KG

RESISTANCE: 0236 LBS/0107 KG

Get The Look You Need

STANDARD UPHOLSTERY COLORS

We offer a variety of upholstery color options — and our standard Raven Black painted frame — at no additional cost.

WE CAN MATCH YOUR REQUIREMENTS

Custom paint and upholstery colors are available to match the requirements of your brand or decor. And you can add custom graphics for a complete branded solution.

SEE HOW KEISER LOOKS IN YOUR SPACE

We’ll help you design your floor plan in the best layout. And our 3D renderings let you see how your space will look with new Keiser equipment. We’ll even include your equipment from other manufacturers. (USA and Canada only)

Your Keiser Representative will provide pricing for any machines you like. Please include the names of those machines in your message. 

Your Location:

Stay Connected With Keiser

Notify me of Keiser Corporation news, events and offers via Email

By clicking yes, you agree to receive special offers, announcements, and more through email and personalized ads on digital and social media platforms. You can choose to stop sharing personal data at any time.

View our Privacy Policy

Your Keiser Representative will help you understand whether Keiser is right for you.

Your Location:

Stay Connected With Keiser

Notify me of Keiser Corporation news, events and offers via Email

By clicking yes, you agree to receive special offers, announcements, and more through email and personalized ads on digital and social media platforms. You can choose to stop sharing personal data at any time.

View our Privacy Policy

Contact us to schedule a conversation with a Keiser design pro. We'll help you make the best use of your space. (USA and Canada only)

Your Location:

Stay Connected With Keiser

Notify me of Keiser Corporation news, events and offers via Email

By clicking yes, you agree to receive special offers, announcements, and more through email and personalized ads on digital and social media platforms. You can choose to stop sharing personal data at any time.

View our Privacy Policy

Contact us to schedule a conversation with a Keiser Performance Coach. (USA and Canada only)

Your Location:

Stay Connected With Keiser

Notify me of Keiser Corporation news, events and offers via Email

By clicking yes, you agree to receive special offers, announcements, and more through email and personalized ads on digital and social media platforms. You can choose to stop sharing personal data at any time.

View our Privacy Policy

Contact Customer Support

To contact Keiser's service department please fill out the fields below. 

Stay Connected With Keiser

Notify me of Keiser Corporation news, events and offers via Email

By clicking yes, you agree to receive special offers, announcements, and more through email and personalized ads on digital and social media platforms. You can choose to stop sharing personal data at any time.

View our Privacy Policy

Location Type

WE’RE SORRY, THE MOBILE SHOWROOM IS CURRENTLY NOT AVAILABLE FOR HOME SALES.

CAN WE HAVE OUR CONSUMER SALES REPRESENTATIVE FOLLOW UP WITH YOU?

Yes
No
No
Yes

Please tell us more about your organization

Product Interests
Please select one of the options below

Stay Connected With Keiser

Notify me of Keiser Corporation news, events and offers via Email

By clicking yes, you agree to receive special offers, announcements, and more through email and personalized ads on digital and social media platforms. You can choose to stop sharing personal data at any time.

View our Privacy Policy

Contact Customer Support

To contact Keiser's service department please fill out the fields below. 

Stay Connected With Keiser

Notify me of Keiser Corporation news, events and offers via Email

By clicking yes, you agree to receive special offers, announcements, and more through email and personalized ads on digital and social media platforms. You can choose to stop sharing personal data at any time.

View our Privacy Policy

Looking for Keiser equipment in your home?

Stay Connected With Keiser

Notify me of Keiser Corporation news, events and offers via Email

By clicking yes, you agree to receive special offers, announcements, and more through email and personalized ads on digital and social media platforms. You can choose to stop sharing personal data at any time.

View our Privacy Policy

Designed by Keiser. Built by Keiser. Backed by Keiser.

Keiser strength machines are backed by our all-product limited warranty. It covers defects in materials and workmanship for up to 10 years (depending on the part in question). Damage caused by abuse, misuse, or neglect of normal care is not covered.

Our warranty covers:

  • Structural integrity of frame members: 10 years
  • Cylinders: 3 years
  • Displays, processor boxes, and thumb buttons: 3 years

See our warranty page for full details

“I tell people: ‘My job’s easy; I only have to design the machine once. Randy has to build it day after day to the high standards we set many years ago, and do it with a team of people that have to believe in Keiser, its mission, and each other to succeed.”

- Dennis Keiser

Close

Keiser fitness equipment is made in the USA

with domestically and globally sourced materials

Dennis Keiser (left)

President

His office is just steps away from
the factory floor

Randy Keiser (right)

Executive Vice President
Head of Manufacturing

His office is on the factory floor

“At Keiser, we don’t just design our machines to be better, we build them to be better. We put them together with our own hands, under the leadership of my brother Randy, Executive Vice President and Head of Manufacturing”

- Dennis Keiser

Close

Attract and retain more members

with the unique capabilities of the A300 Leg Extension Pro

plus
Attract and retain members with unmatched versatility
plus
Don’t lose members to injury and pain
plus
Member loyalty through faster results
plus
Worry-free operation — better member experience
plus
Make the most of your limited floor space

TRY KEISER STRENGTH FOR YOURSELF

One of our Demo Vans will bring two of our strength machines to any location in Mainland UK and Scottish Highlands. And we’ll bring other machines from our functional, racks, and cardio lines for you to try.

The A300 Leg Extension Pro gives you an advantage

over those who train with conventional machines

TRY KEISER STRENGTH FOR YOURSELF

One of our Demo Vans will bring two of our strength machines to any location in Mainland UK and Scottish Highlands. And we’ll bring other machines from our functional, racks, and cardio lines for you to try.

Less pain, more patient visits

Improve patient experience with Keiser strength machines

plus
Build confidence faster with 1-pound increments
plus
Less patient pain, more patient visits
plus
Easy, precise eccentric overloading
plus
Restore functional power
plus
Better patient experience — get more referrals
plus
Make the most of your clinic's limited floor space
plus
Quiet operation is less disruptive and improves the patient experience

TRY KEISER STRENGTH FOR YOURSELF

One of our Demo Vans will bring two of our strength machines to any location in Mainland UK and Scottish Highlands. And we’ll bring other machines from our functional, racks, and cardio lines for you to try.

Be the clear choice for older adults

with the unique advantages of Keiser strength machines

plus
Designed around the needs of older adults
plus
Made for every fitness level and ability
plus
Pain-free range of motion. Lower risk of injury.
plus
Keiser is an effective tool in marketing your facility
plus
Make the most of your limited floor space
plus
Quiet operation

TRY KEISER STRENGTH FOR YOURSELF

One of our Demo Vans will bring two of our strength machines to any location in Mainland UK and Scottish Highlands. And we’ll bring other machines from our functional, racks, and cardio lines for you to try.