Training in the morning - low energy

Hey guys! I've been training for my first duathlon and right now the thing I struggle with is training in the morning. I'm a morning person but I've never been able to actually train in the morning. Even if I feel fresh and energized, when I start training my body still seems at 20% capacity, and don't really have enough strength for a workout until around lunchtime. That kind of worries me, because the duathlon I signed up for starts at 8 A.M and right now the only strategy I can think of is waking up six hours before.

Are there any tips to switch to morning workouts? Most of the information I've found is about building the habit of waking up and get going, but as I said, I'm usually up by 6 and going anyways. Thanks in advance!