How to Get a Good Cardio Workout When Running and Swimming Bother Your Knees

Knee discomfort does not mean you have to give up on cardio. Running and some forms of swimming are only two options, and both can be swapped for low-impact activities that still raise your heart rate and breathing. The key is choosing a mode your knees tolerate, then controlling intensity and progression so your knees can keep up.

Choose low-impact modes

Cycling is one of the most common alternatives because the knees move through a controlled range while the body is supported. Rowing and the elliptical also keep impact low, although a rowing stroke can still stress the knees if they drift out of line, so check your knee position. Brisk walking, incline walking, and walking or jogging in water are useful too. Water-based running can give a strong workout with little impact.

Swimming is not automatically knee-friendly for everyone. Some people find the breaststroke kick uncomfortable, and changing stroke or kick can help. Pool work that avoids the kick, such as pulling or water walking, may suit some people better.

Set intensity by how you feel

Activity guidelines are useful as a target. The WHO adult guidelines suggest at least 150 to 300 minutes per week of moderate aerobic activity, or 75 to 150 minutes of vigorous activity, plus muscle-strengthening work on 2 or more days. These are weekly targets, not requirements for a single session, and many different activities can reach them.

A simple way to judge moderate intensity is the talk test: you can speak in full sentences but would find singing difficult. Vigorous intensity usually leaves you able to say only a few words at a time. Use knee symptoms as a guide too. Mild discomfort that stays steady and settles after the session is different from sharp pain, pain that rises during the workout, or pain that is worse the next morning. Reduce intensity or duration when those last signs appear.

Build gradually and support the knees

Increase time before intensity. Adding a few minutes each week is generally easier on joints than sudden jumps in hard intervals. Spread sessions across the week rather than stacking several hard ones together.

Strength work supports the muscles around the knee, and many people find that helpful for tolerance. Hip and thigh exercises are a practical place to start, performed with control and within a comfortable range. This may not remove knee pain entirely, and results vary between people.

When to get it checked

Knee pain that involves swelling, locking, giving way, sharp pain, or steady worsening over several sessions should be assessed by a physiotherapist or doctor. A professional can identify what is happening and set a plan that fits your knee.

Takeaway

Pick low-impact activities your knees tolerate, build time gradually, and let symptoms guide intensity. Good cardio does not depend on running or swimming, and persistent knee symptoms are worth a professional look.