Knee-Friendly Training: Squats, Lunges and Box Jumps
Updated: 24 hours ago
She walks in, reads the whiteboard and her face drops: 100 walking lunges, 50 box jumps, then back squats. Her knee has been cranky for a week. Not injured, exactly, just sore on the stairs and stiff after sitting. She has two choices in her head. Skip the workout, or grit her teeth through it.
That athlete is a composite of many I've coached, and her dilemma is one of the most common I see. I've stood in her shoes too, after weeks with a lot of jumping when my knees felt stiff and grumpy on the walk to the car. Both of her options are usually wrong. Skipping loses a training day and often the momentum that comes with it. Grinding through pain can turn a sensitive knee into a knee that keeps you out for weeks.
There's a third choice: train around the problem, not through it. That means knowing which versions of squats, lunges and box jumps your knee tolerates today and using those while it settles. This is the menu I use with my athletes.
IN THIS ARTICLE
First, a line you don't cross
This article is about modifying training for knees that are sore or sensitive, not about diagnosing or treating an injury. Some signs mean you should stop and get assessed by a physiotherapist or doctor before you train the leg again: significant swelling, a knee that locks, catches or gives way, sharp pain with specific movements, pain after a fall or a twist, or pain that wakes you at night or keeps getting worse over several weeks.
If none of those apply, a useful guideline many physiotherapists use is a simple pain scale. Discomfort up to about 3 out of 10 during training, which settles back to your normal level within 24 hours, is usually acceptable. If pain climbs above that during the session, or the knee is noticeably worse the next morning, the dose was too much and the next session needs to be easier.
Discomfort is information, not an enemy. You just need to listen to it with some precision.
The modification menu
Think of these options as a ladder. Start with the version that keeps you in that low-discomfort zone, and move back toward the original movement as your knee calms down over days and weeks.
Movement | Easier on the knee | Stepping back up |
|---|---|---|
Back squat | Box squat to a height that feels comfortable, slow tempo, lighter load | Goblet or front squat to full depth, then back squat with progressive load |
Air squats in a metcon | Squats to a box or bench, reduced reps | Full-depth air squats at a controlled pace |
Walking or forward lunges | Reverse lunges or split squats holding a support | Unsupported reverse lunges, then walking lunges |
Box jumps | Step-ups on a lower box, or row or bike calories | Jump up, step down, then rebound only when fully comfortable |
Pistols and jumping lunges | Single-leg box squats to a high target | Lower target over several weeks |
A few principles tie the menu together. Reducing depth and range usually reduces load on the knee, so limiting how deep you go is a smart temporary tool. Controlled tempo lets you own the position instead of dropping into it. And removing impact, especially the landing and rebound in box jumps, is often the single biggest relief.
Why reverse lunges and step-downs earn their place
Forward and walking lunges ask the front knee to absorb your body weight as you step into the movement, often with the knee traveling well forward. Reverse lunges shift more of the work to the hip and let you control the descent, which many sensitive knees tolerate far better. It's the same muscles doing similar work, with a gentler entry.
Box jumps follow the same logic. The jump up is rarely the problem. The landing on the way down and the fast rebound into the next rep are what irritate knees and Achilles tendons. Volleyball taught me this long before CrossFit did: you jump all day, but it's the landings that add up. Stepping down every rep removes most of that stress, and it's also a smart choice for anyone doing high-volume box jumps while tired.
Step-ups deserve a special mention. With the box at a height that keeps the working knee below the hip, and a slow, controlled lowering, they build single-leg strength with very little risk. I program them often, sore knees or not.
Coach's cue: Train around the pain, never through it, and let the knee earn back every step of the ladder.
Build the knee's support crew
Modifying movements buys you time. Getting stronger is what gives you durability. Knees tend to do better when the muscles around them, and the hips and ankles above and below them, are strong and capable. While your knee settles, keep training those areas on purpose.
A simple accessory block I often use, two or three times a week, looks like this:
Spanish squats or wall sits: 3 to 5 holds of 30 to 45 seconds, at a depth that stays comfortable.
Step-ups or step-downs from a low box: 3 sets of 8 to 10 per leg, slow on the way down.
Hamstring work, such as bridges or Romanian deadlifts: 3 sets of 8 to 12.
Calf raises, straight and bent knee: 3 sets of 12 to 15.
Side-lying or banded hip work: 2 to 3 sets of 12 to 15.
Progress the load gradually, using that same pain guideline. Isometric holds like wall sits are often well tolerated early, which is why I like them as a starting point. Athletes usually hate them for the first week, then quietly notice the stairs feel easier.
Talk to your coach before the workout, not during it
Coaches can't scale what they don't know about. Tell your coach about your knee before class starts, and ask which options from the menu fit today's workout. A good coach will adjust the stimulus so you still get the intended intensity: if the workout is meant to be a fast, breathy sprint, swapping box jumps for bike calories keeps that feel without the landings.
Some of the best conversations I've had with athletes happened in those two minutes before the warm-up. Someone mentions their knee almost as an apology, we swap two movements, and they leave having trained hard instead of sitting out or limping home.
Also look at your week as a whole. If your knee is sensitive, three leg-heavy classes in a row may be too much, even with modifications. Spreading them out, or turning one into an upper-body or engine session, often helps more than any single exercise change.
Back to full training, one rung at a time
Most sensitive knees improve with sensible load management and consistent strength work. The athletes who get back fastest are rarely the ones who push hardest. They're the ones who respect the details: they track how the knee responds, climb the ladder patiently and keep showing up.
If your knee keeps flaring up, or you want a plan that builds strength around it while you keep training toward your goals, individual coaching with ATHLETESPHERE gives you personalized programming, video review and a coach who adjusts the plan as your knee responds. Please keep your physiotherapist or doctor involved for anything that needs assessment.
Your turn. Tried this? Tell me how it went in the comments below. I read every one, and your questions help shape what I write next. If it helped, tap the heart so it reaches more athletes.
Keep reading
Further reading: American College of Sports Medicine (ACSM)
Coach Fritz Bautista · Head Coach, ATHLETESPHERE
CrossFit Level 2 Trainer (CF-L2) ✓ · CrossFit Programming Certificate · MBA · Digital Marketing Certified · Coaching athletes from all walks of life online
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