My knees click and I need to build muscle around my knee?

I am a runner but thought I should change to either a bike or elliptical? My concern with a bike is I am not sure if it will burn as many calories as

I am a runner but thought I should change to either a bike or elliptical? My concern with a bike is I am not sure if it will burn as many calories as an elliptical would. I was also looking at the bow flex tread-climber?

or:I am a runner but thought I should change to either a bike or elliptical? My concern with a bike is I am not sure if it will burn as many calories as an elliptical would. I was also looking at the bow flex tread-climber?


or:Try switching back and forth between a bike and running. Also try weight lifting for thr legs.

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