Returning to the Gym After Knee Replacement: How to Rebuild Strength Safely – Episode 99
A practical framework for choosing gym exercises, resistance, range, and progression after knee replacement without trying to rebuild everything at once.
By Michelle, PT, DPT, The Total Knee Success Podcast
Returning to the gym after knee replacement can feel surprisingly unstructured. Physical therapy usually provides a plan, supervision, and help deciding when to progress. At the gym, the equipment is still there, but those decisions become more independent.
Prefer to listen? Play Episode 99 below for the complete discussion.
Have you recently had a total knee replacement, or are you preparing for surgery and wondering what recovery will really be like? Welcome to the Total Knee Success Podcast, your resource for total knee replacement recovery and life after surgery. Hosted by Michelle Losurdo, a trusted doctor of physical therapy and board-certified orthopedic clinical specialist, this show is designed for anyone considering, preparing for, or recovering from knee replacement surgery.
In about the time it takes to put a cold pack on your knee, each episode shares practical total knee surgery tips, evidence-based guidance, and clear strategies to help you manage pain, improve mobility, and thrive through the healing process. You’ll learn about post-operative knee rehab exercises, approaches to knee replacement physical therapy, and real-world tools for building confidence, improving sleep, maintaining a healthy diet, and regaining natural movement. From time to time, you’ll also hear patient perspectives and success stories that encourage you along the way.
Michelle also highlights the mindset and motivation strategies that make a lasting difference in recovery—helping you stay positive, focused, and resilient. And if you’re a family member, friend, or caregiver supporting someone through a knee replacement, you’ll find valuable insights here, too.
Please remember: Michelle is not your personal therapist and does not know you. This podcast provides general education and opinion only. Always consult your healthcare provider before making changes to your recovery plan. This podcast is not related to her clinical or teaching roles.
If you’re ready to feel stronger and more confident on your journey—or if you’re supporting someone you care about—this is the total knee replacement podcast that will help you succeed—one step at a time
Episode 99 explains how to move from formal physical therapy into independent gym training after knee replacement. Michelle discusses cardiovascular equipment, machines, free weights, leg strengthening, balance work, and how load, range, and speed change an exercise.
Read Episode 99 article & resources
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The Episode also explains how to begin with a small program, monitor swelling and stiffness, and progress without changing too many variables at once. Listeners will learn why a repeatable program is often more useful than an aggressive first workout.
Book! (Prehab) Knee Replacement Game Plan
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Book! Making Sense of Pain After Knee Replacement
Book! Walking Like Yourself Again After Knee Replacement
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Resources at totalkneesuccess.com
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Medical Disclaimer: This podcast is for educational purposes only and does not constitute medical advice. The content is not intended to replace individualized medical guidance, diagnosis, or treatment. Always consult your surgeon, physical therapist, or other qualified healthcare provider regarding your specific condition, surgical decisions, and rehabilitation plan.
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Evidence-Based Content Statement: All information presented in this episode is grounded in peer-reviewed research, published clinical guidelines, and current best practices in orthopedics and rehabilitation.
Music Licensing Statement: Intro and outro music for the Total Knee Success Podcast is licensed for commercial use. Editing and production for this episode were completed using Descript.
Start With What You Can Control Today
Your first gym workout does not need to recreate what you did before surgery. Strength, knee motion, balance, endurance, and movement quality may still be developing even when formal physical therapy is ending.
A useful starting program is usually smaller than people expect. Fewer exercises, lighter resistance, a comfortable movement range, and adequate rest make it easier to see how your knee responds.
Changing several things at once makes that harder. If you add heavier leg presses, longer treadmill walking, lunges, and extra sets in the same session, increased stiffness or swelling afterward gives you very little useful information about which change contributed.
Machines, Free Weights, and Cardio Equipment
Machines can provide stability and guide the movement path. That may be useful while rebuilding strength or working one leg at a time. The tradeoff is that the machine determines much of the position, so the seat, pivot point, and starting range need to fit your body.
Free weights require more balance, coordination, and control. They may be appropriate early for some people and a later progression for others.
Cardiovascular equipment also varies considerably. A stationary or recumbent bicycle allows repeated knee motion without the repeated foot strike of walking. Treadmills require familiarity with a moving belt, while ellipticals add balance and coordination demands. Rowing machines can require substantial knee bend, including during the dismount.
The equipment that looks easiest is not necessarily the easiest for your knee.
Build Strength by Adjusting Three Variables
Resistance training after knee replacement does not depend on finding one perfect exercise. Leg presses, knee extensions, hamstring curls, calf raises, sit-to-stands, step-ups, and selected hip exercises can all be used in appropriate situations.
Three variables change the difficulty of almost every exercise:
Load
A reasonable resistance allows you to maintain a consistent movement pattern. Jerking the weight, holding your breath, shortening the movement unexpectedly, or shifting most of the work to the other leg may signal that the setup or resistance needs adjustment.
Range
More range is not automatically better. A smaller controlled range may provide a better starting point than forcing your knee farther while your pelvis, trunk, or foot changes position to compensate.
Speed
A smooth, deliberate pace can make an exercise easier to evaluate. Momentum may reduce control and make it harder to tell which muscles are doing the work.
Changing one variable at a time can make your knee’s response easier to interpret.
Use Your Knee’s Response as Information
Muscle fatigue and effort are expected parts of strength training. Symptoms are more complicated because their meaning depends on your stage, medical history, exercise selection, and other factors.
Sharp or increasing pain, new buckling, loss of control, or movement that becomes progressively more uneven should not simply be treated as ordinary exercise fatigue. After training, changes in swelling, stiffness, walking quality, and next-morning symptoms can provide additional information.
Persistent or increasing swelling, worsening pain, repeated instability, new loss of motion, inability to bear weight, marked swelling, calf pain or swelling, fever, spreading redness, or wound drainage deserve medical evaluation. Sudden chest pain or sudden shortness of breath requires emergency care.
An Optional Cycling Tool for Home
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A Pedal Exerciser offers a compact option for repeated cycling motion at home. Seat position, resistance, range of motion, and timing should match the guidance provided by your surgical or rehabilitation team.
Do not force a full revolution, add resistance, or begin before your surgical or rehabilitation team has cleared the activity.
Stay Active Anytime - Compact & Portable Design: Whether working at your desk or relaxing at home, the pooboo under desk bike helps you stay active without taking up much space. Weighing only 18.9 lbs with a built-in handle, this under desk bike is easy to carry and store, making fitness simple and convenient for busy lifestyles.
If walking remains awkward, uneven, or tiring as strength develops, Walking Like Yourself Again After Knee Replacement is an intentionally concise, evidence-informed guide that explains why walking can still feel awkward, uneven, or tiring and how smoother, steadier movement often develops over time.
Why Walking Feels Awkward and How People Rebuild Smooth, Confident Walking for Everyday Life (The Total Knee Success Series Book 2)
Frequently Asked Questions
Can I use the leg press after knee replacement?
Leg press exercise can be used in some post-knee-replacement programs. Foot position, seat angle, depth, resistance, current restrictions, and movement control all affect the demand.
Is the knee extension machine bad for a knee replacement?
A blanket rule that knee extension should never be used after knee replacement is too broad. Knee extension exercises are used in rehabilitation and research to train the quadriceps. The appropriate range and resistance depend on the individual situation.
How many exercises should I do when returning to the gym?
There is no universal number. A smaller program can make it easier to evaluate technique and your knee’s response before adding more exercises, resistance, repetitions, or time.
Keep the Program Understandable
A useful gym program is not defined by the heaviest resistance or the longest exercise list. It should be organized enough that you can identify what you did, observe the response, and understand what changed when you progress.
If you are transitioning out of physical therapy, your final visits can also be an opportunity to discuss longer-term exercise choices and equipment.
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Educational disclaimer: This article provides general educational information and is not individualized medical advice, diagnosis, or treatment. Exercise selection should reflect your current restrictions, health conditions, symptoms, and guidance from your surgeon, physical therapist, or other qualified healthcare professional.
References
- Liu HW. Resistance training in patients with total knee arthroplasty: a systematic review and meta-analysis. J Orthop. 2024;56:111-118. doi:10.1016/j.jor.2024.05.006.
- Orange GM, Hince DA, Jones M, et al. Physical function following total knee arthroplasty for osteoarthritis: a longitudinal systematic review with meta-analysis. J Orthop Sports Phys Ther. 2025;55(1):1-18. doi:10.2519/jospt.2024.12361.
- Jette DU, Hunter SJ, Burkett L, et al. Physical therapist management of total knee arthroplasty. Phys Ther. 2020;100(9):1603-1631. doi:10.1093/ptj/pzaa099.
- Jakobsen TL, Jakobsen MD, Andersen LL, Husted H, Kehlet H, Bandholm T. Quadriceps muscle activity during commonly used strength training exercises shortly after total knee arthroplasty: implications for home-based exercise selection. J Exp Orthop. 2019;6(1):29. doi:10.1186/s40634-019-0193-5.
- Bade MJ, Struessel T, Dayton M, et al. Early high-intensity versus low-intensity rehabilitation after total knee arthroplasty: a randomized controlled trial. Arthritis Care Res (Hoboken). 2017;69(9):1360-1368. doi:10.1002/acr.23139.
- Husby VS, Foss OA, Husby OS, Winther SB. Randomized controlled trial of maximal strength training versus standard rehabilitation following total knee arthroplasty. Eur J Phys Rehabil Med. 2018;54(3):371-379. doi:10.23736/S1973-9087.17.04712-8.
- Minick KI, Hunter SJ, Capin JJ, et al. Improved outcomes following a care guideline implementation: part 1 of an analysis of 12,355 patients after total knee arthroplasty. J Orthop Sports Phys Ther. 2023;53(3):143-150. doi:10.2519/jospt.2022.11369.