Getting sleep is important because without it you could drained or you could make careless mistakes and it can also cause your body to weaken so true
That statement is true
Our human brain is not designed to experience prolonged stress. In short term, stress does increase our adrenaline which help us became more alert and focused.
But prolonged exposure to it could cause some health risk such as increased blood pressure.
And by channeling our stress into coping strategies, it help us to manage it and decrease our adrenaline level
This is an example of lack of self management. Dianne is experiencing lack of self management, which resulted in a difficult time adjusting her stroke when playing tennis because she's used to playing badminton.
Hope this helps. - M