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Here is problem with cardio that I don't see discussed.

Most of my tendon / joint aches have come from cardio that I have done for an hour or more.

Basically you are repeating the same motion over and over again.  

So I got tennis elbow in my right arm from using an elliptical machine for an hour, I was pushing on the moveable handles too hard, I got persistent knee pain from a stair climber by using it to climb 120 flights of stairs, and a groin pull from my bike seat being 1/2 inch to high.  It took a couple of weeks of doing this sort of thing to start to have problems.

So I am very careful to gradually increase time, heart, lungs and muscle adapt much fast than joints and tendons.  Meaning I can do more / longer, but after a while it will cause a problem that takes months to go away.