Wrestling Shape

Question
I've heard many a time that a person who's in shape will have to get in "Wrestling Shape" to wrestle well.
I consider myself in medicore wrestling shape. My question is that, what are the major differences between a normal atelete and an athelete in "wrestling shape"?
And How do some people get in better shape as a wrestler?

Should I do excises according to my wrestling style to improve my wrestling? Please give me some examples...

Thank You! Have a nice day.

Answer
actually, i get this question, or ones worded similarly quite often.  with different sports come different emphasis on conditioning. distance runners do just that, run long distances.  of course you could start by running, but simply running a lot won't do it.  wrestling is like running long distances while doing a whole body heavy lifting workout, all in the span of 6-7 minutes.  
if you want to start by running i would suggest running ramps or hills.  something inclined that will require you to explode for a long distance.  these should be distances of long sprints 100-200 yards.  if you have a treadmill that inclines, those work too.  you have more control with speed and weather and whatnot, so i like those.
lifting-wise, at Illinois we try to do more sport-specific movements.  most focus on power and endurance.  so heavy, but not too heavy weight done for 5-8 reps.  another focus of ours is joint stabilization.  i'll equate this to bench press.  using a bar is easier than using dumbbells.  with dumbbells, each one can move and fall and rise on its own, and you have to be accountable for all of that, which makes using dumbbells a little more difficult.  the same with your joints.  standing on both feet, you have a little more security and balance.  but on balancing on one while you lift something is a little tricky.  and being on one leg is a situation you will often find yourself in while wrestling.  i'm not saying just stand on one foot and lift.  the weights have to be dramatically decreased and movements more controlled. but there are many exercises that you can do to utilize joint stabilization: single leg dumbbell rows, shoulder presses(utilizes shoulders, knees, and ankles), split leg squat(one leg up on a box or elevated surface just behind you, works each leg without the benefit of having other as backup)
Exercising according to your style is another means of improving your condition.  This is a scenario you won't find in a large team atmosphere where workouts are generalized and not specific to each athlete.  If you're a more methodical wrestler than i would say to do more of a circuit lift.  many exercises in a row, low weight, high reps, little rest.  if you're a more energetic, explosive wrestler, then more of a pyramid scheme might benefit you.  begin with high reps litter weight, and as reps go down gradually the weight goes up.  so there are many different ways to do things and i hope this has helped. good luck!