Thanks - this is exactly my situation. If I make it 10, I make it an hour...
"fluidity" is exactly the feeling that I get once I get there...it's getting there that's the trick!

"Blasting into anaerobic" is very much what it felt like...I'm slowing my pace a bunch (jogging at a fast walk) and that's been the most important thing, I think I was starting too fast.

Still hard to start, but not AS hard...thanks for giving words to what I need to know.