So i have been trying to focus on getting back into good cardio shape now that the weather is good - biking and running. if there was topography here i wouldn't worry about my HR and would go out and have fun, but since there is none, i am trying to focus on my HR to make it interesting.
anyways, i have read a bunch about it and keep finding that the best area for improvement is staying in the 65 to 75% range for a good long while (several weeks) - eventually the inensity and pace you can maintain in that range increases and does so more rapidly than if you work out at different levels.
that said, it is boring as fuck because my 65 - 75% pace is moderate on my bike and very slow running. i guess i am used to working out at 85 - 90% (albiet when i did I saw nearly zero improvement in running times after 6+ months).
so i am willing to give this a shot for a while longer if people have had good experiences with it. otherwise i am going to go back to red-lining it all the time. any knowledge is greatly appreciated.