Originally Posted by BigGear

These are the numbers:

Last year:
Average time: 9:30
Average HR: 163
Wind: 8mph N

This year:
Average time: 09:30
Average HR: 173
Wind: 16 mph N

I am feeling stronger this year, but this LT HR puzzles me.

On one hand as I understand it is good if LT HR increases, you can do more work at the higher HR rate, but on another hand the speed should increase too, correct?

How does generaly LT HR relate to speed? I would like to understand this better..