[Andrew Bollard]

It’s hard to say without knowing more about your training background, current weekly volume and objectives you’re training for, how much experience you have with ME and how your body responds etc. If you know from past experience that you can do an AM Z1-Z2 session and recover well enough to do a PM ME session and it suits your schedule then I’d say go for it, assuming you’re already modulating the volume and intensity of your aerobic capacity work as best you can. If you provide more details, then hopefully someone more knowledegable than me will be able to provide a more concrete answer.