This Half-Marathon Version 2 plan is design for someone who as gone through our original training plan once/twice/or a few times. You will begin with a bit longer long runs and workouts will begin a bit earlier than the original Half-Marathon plan. This Half-Marathon training plan (up to 16 weeks long) includes my tried and true, scientifically-based and proven marathon workout sequence. You'll improve your endurance with progressing long runs. You'll boost your stamina and speed with my ...