I've been doing a lot of riding and at moderate to high intensity. I've also been reading about building a good base however this will mean riding at less than 80% of max HR which is about 145bpm for myself.
But the speeds this is done at will be a lot slower and the riding easier.
It just doesn't make sense that riding at 25kmh for 2 hours is going to help at the next club ride. What am I missing here?