I Trained Last Friday And Ended The Session With A

I trained last Friday and ended the session with a vigorous split rowing session. At one stage I thought my head was going to burst. After the session I was very pale and need to lie down for half an hour. I will be 58 in Feb 2017, have trained regularly (Weights and CV) for over 2 years. I suffer from athritis though Humira keeps all at bay.

Why the pale look?

Andrew