I actually had my blood pressure measured this morning during a routine examination at the hospital. At first I thought something was wrong because the nurse made a surprised "Oh!" but then I realised she was just positively surprised by the very good blood pressure and heart rate results. "That's what we want to see," she congratulated me.
I want to believe that my cold showers and my other routines (sleep! etc) have contributed to it. I have actually rarely felt so well, physically and mentally...

No, but I wanted the lower resting heart rate benefit. 