Originally Posted by
livedarklions
I get pain when I ramp up duration or if some factor like a headwind has upped the intensity for a prolonged period of time. I think it's also a good indicator of going beyond your baseline (which might be very strenuous) OR not having worked them strenuously recently.
Yeah, that's a good way of putting it. I will notice that early in the season (or if my fitness has fallen off midseason) my back will get really tight and sore if I am going too deep too long.