if your blood pressure is 120/80 or 140/90 mmHg its normal, if its 140/90 mmHg or higher you have high blood pressure and if its 180/110 mmHg or higher than that you have really high blood pressure.
Well it can vary from a number of heights and usually in an Olympic standard pool there is a 1 metre, 2.5 metre, 3 metre, 5 metre, 7.5 metre and a ten metre boards