No they don't need any fitness retirements however, they would need good eyesight and strong concentration.
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You don't really need to be fit, you just need to watch what happens on the court at all times.
Well they have to be able to run around out of the cort and follow the ball so they will have to have quite a bit of energy so i guess so
fitness, patience, a thick skin, willingness to keep up constantly with the rules of the game, to be reassessed and trained, and a general love of the sport.
Not that fit ! They're usually sat on a raised seat - on the centre line of the court so they can see all the actions.