Looking into this issue, it appears that the Ramp test is left off when you set the start date of your plan in the past. It should still prescribe the Ramp test as the first workout, but it’s not working quite right.
I have written up an issue for it, and we will be working with our Development Support team to prioritize and resolve the bug 
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In the meantime, go ahead and sub-out your first workout for the Ramp Test and you’ll be good to go.