FUNNY HOW things click all of a sudden. I discovered this morning why I can get exhausted when performing front crawl .... I am kicking too hard. Using the pull buoy and paddles I forced my legs completely out of the stroke and swam 1500 metres with relative ease. I could have swam even further. I was hardly out of of breath after the distance and my heart rate felt fairly relaxed. A moment of clarity perhaps? Next, do it again without the pull buoy.
After some breakfast, out on the bike for a 50 km tempo ride.