Is Jogging on hard-ground bad for the legs?

Answers:

YES. Concrete (i.e. sidewalks) are the hardest ground you will ever find and you should avoid running on it if you possibly can. It's true that your bones have reparative capabilities, and having good muscle strength in your legs will help protect your joints as well (get thee to the gym and do thee some squats!) but you also need to do your part by running on the lowest impact surfaces that you can find. Asphalt (i.e. the side of the road) is a much softer alternative than a concrete sidewalk and dirt trails or tracks are even better.

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No, not exactly. Repetetive stress from impact can be hard on the cartilage in your joints, but unless you're running marathons on a consistent basis, there's not much to worry about (unless you're significantly overweight, then you should be more careful).

Stress from weight and impact actually strengthens your bones. By making small fractures every time you stress them, the fractures heal to be stronger than before. Just make sure you have enough calcium in your diet.

Jogging on hard ground is also better than, say, jogging on a treadmill. On a treadmill, your movements are limited (no side-to-side or turning motions), and thus will stress your joints in a more particular way, causing aches and eventually arthritis.

Jogging on grass is good, and is recommended for people recovering from certain orthopedic operations or leg/foot related accidents. However, as a runner myself, it frustrates me when I see people running on grass that isn't meant for heavy trafic, since they will eventually wear a path into the grass, detracting from its natural beauty.

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knees, ankles, and hips actually. but I wouldn't say it's worse than sitting on the couch.

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