Thank you very much Scott, that is really helpful.
Great suggestion with the sleds! I had tried hill sprints on steps but found I could never get the balance of taking too few or too many stair steps per step right- at least on the steps I had available.
I trust your suggestions will work but I am curious of the theory behind switching up sprints/ME blocks with Z3 blocks. If my only goal is to get stronger long term and not have whimpy legs on my long runs why not just do sprints/ME? Z3 is fun though so I’d probably do a block anyway :).