Law Of Diminishing Returns
According to the Law of Diminishing Returns (also known as Diminishing Returns Phenomenon), the value or enjoyment we get from something starts to decrease after a certain point. Let’s say we go to an amusement park and ride our favorite roller coaster five times in one day. The first time is exhilarating. The second and third times are also exciting. But after the fourth or fifth ride, we start to feel sick and bored - we’ve had enough. The law of diminishing returns also applies to performance.
Although it's important to study for an exam or practice for a game, there is a limit to how much time and energy we can invest and still expect to see an improvement. If we practice too much we’ll start to feel burned out and may even start performing poorly.