Debbie's Marathon hikes challenge

As many of you known i love to hike.
This year my nephew was diagnosed with Aplastic anemia, something I never really knew about before. He recently had a bone marrow transplant and is still recovering in hospital.
The Mountain Coach who I go hiking with is putting on a 7 Marathon hikes challenge and my aim is to complete at LEAST 5 of those over the next year
26 miles is 41 km, I'm used to doing half that at a time so this is a real challenge for me.