This was a very positive pre-plan long run: 10.8 km at 6:51/km with controlled effort and good sensations. The session felt relaxed, which is exactly the right signal before starting a structured marathon block.
The second half was slightly quicker with a modest heart rate rise, but nothing suggests overreaching. The main takeaway is that the aerobic base is stable and ready for the Garmin Intermediate marathon plan.
This is a good place to start: not tired, not overtested, and with enough recent consistency to let the plan build gradually.
Takeaway. Use Garmin as the structure, but keep the execution pace-based. Easy days should stay clearly easy, especially during the first weeks of the marathon block.
Next step. W01D2 Easy Run. Easy aerobic running to start the marathon plan smoothly. Keep it relaxed, conversational, and deliberately below workout effort.