Both stationary bikes and elliptical machines should be good for your knees according to the following sources. Complement this with squats and/or leg pressses — moderate weight? Avoid seated leg extensions and leg curls with heavy weights. Only do these with very, very light weights or no weight at all.
With the bike you want to perform some steady-state cardio for 20 minutes or
more, if possible, to build up a good base for your
aerobic endurance.
But this is not quite enuff since endurance for a sport like tennis requires both your aerobic system and two different
anaerobic systems. To develop your anaerobic systems you can also Include some
interval training with your bike riding. These intervals should include some easy, low intensity cycling (30-45 seconds perhaps) alternating with periods of high intensity cycling (15-30 seconds). Other interval patterns may also be useful.
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Many people suffering from knee pain may not be exercising properly. There is an assumption that a low-impact session that will go easy on the knees won’t give a high-intensity cardio workout with discourages people from working out. This, however, is likely to cause further injury. In fact...
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Stretching and strengthening exercises may improve your knee joint's range of motion and flexibility. This can make it easier to move your knee without pain.
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