It’s the top of z3, lower end of z4. It’s a good place to spend time as you develop a really good aerobic engine without accumulating a lot of fatigue, so you can do repeat sessions each week without digging a hole.
@TTM started
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It’s the top of z3, lower end of z4. It’s a good place to spend time as you develop a really good aerobic engine without accumulating a lot of fatigue, so you can do repeat sessions each week without digging a hole.