• What is lactic acid and lactate?
• Benefits of Zone 2. 
• Case study on training using lower HR for aerobic conditioning. And a follow up to that.
• On the dreaded gray zone- training too hard to be aerobic but not hard enough to get faster 
• One more on lactic acid and why it isn't bad.
• What is TSS in Training Peaks? What about ATL and CTL? 

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