Ok this is the second time in a row this has happened and I'm concerned.
My cardio these days consists of 10 or so laps of the nearby track then home for some jump rope in my garden. Nothing overly taxing - moderate pace.
But for the second time in a row after 2-3 laps my energy just disappears and I feel weak and tired.
I'm on a hypercaloric diet and my last C+P meal was about an hour beforehand.
Really pissing me off.