I used to commute between college-town next to university to downtown to work in bike-shop, 13-miles. Being ADD, I always got bored going slow, want that speed and adrenaline! I trained with sprints, intervals, hillclimbs to increase my speed so I can do that commute in 45-min or less.
That led to an encountre with school's Cycling Team and 10 glorious years of racing.