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In Wudoo’ it’s obligatory to wash body parts 3 times

“The scholars are unanimously agreed that what is obligatory in wudoo’ is to wash each part once, although washing each part two or three times is Sunnah… But we should not persist in washing each part only once and not do that which is more perfect, because by doing so we are depriving ourselves of more reward.” [Islam Question & Answer]
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Intentionally over-exhaust oneself in worship increases the reward

“The one who deliberately over-exhausts himself will not be rewarded if his aim is hardship, rather he will be rewarded if hardship accompanies an action that he is required to do. That is because hardship is not to be sought in and of itself…
For example: if a person says I will go for Hajj on foot so that I may be exhausted in Hajj and my reward will be greater, it should be said to him: Seeking hardship is not prescribed, because the Lawgiver does not intend hardship, so by your action you are going against the aim of the Lawgiver.” [Islam Question & Answer]
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