Ferguson said: “The amount of days where I thought it would never be possible.
“The days of waking up at five in the morning, leaving the RV in tears thinking why have I set it that high? Who do I think I am?”
He said hitting the target for his arrival in Boston was “a dream come true”.
“To be handed a miracle at the end, to hit it the day before finishing, it’s the stuff that dreams are made of,” he added.
Ferguson said he wanted to raise awareness, as he did at the Euros in 2024, after seeing friends and family suffer the impact of poor mental health.