"Unshed tears leave a deposit on your heart. Eventually they form a crust around it and paralyze it, the way mineral deposits paralyze a washing machine."

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If you are training properly, you should progress steadily. This doesn't necessarily mean a personal best every time you race ... Each training session should be like putting money in the bank. If your training works, you continue to deposit into your 'strength' account ... Too much training has the opposite effect. Rather than build, it tears down. Your body will tell when you have begun to tip the balance. Just be sure to listen to it.

— Grete Waitz