26.2 miles, 42.195km, 50,000+ steps, 4,689 laps around your sofa or 46,112 yards. However you measure it the marathon distance is one of the toughest and most rewarding things you can put your body through. Ever since my first at the London Marathon back in 2016 I have been well and truly addicted to the highs and lows that sort of distance takes you on.