I've been talking to a friend about training recently and after he came to the conclusion he needed to do more zone 2 (read: endurance pace) work I had a bit of an epiphany and realized I do too. The sources of information are these.
- Phil Maffetone's heart rate formula
- Joe Friel's advice
- My lack of fitness when it comes to longer runs
When I was cycling a lot I had a huge aerobic base. Now that I'm running - and because my body can't tolerate running seven days/week and because of some injuries - that base has eroded significantly.