Runner only.
I’ve noticed that older runners with cycling experience have have closer times when I compare their times on track and road. Also, there is anecdotal evidence and some research that spinning can help runners on the hills and with cadence.
I went through the Stride Academy plan twice and never really got to where I should be with the cadence workouts; when I upped the cadence I consistently exceeded the desired zones. Similarly, there are only a couple of hill workouts in the event plans that are more strength focused than on muscular endurance.
So, I want to use the prep phase to address a weakness I perceive in my running.