Trail Vert Half-Marathon Level 2 (Intermediate) - 0-600 ft. of Vert 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 marathon specialty workouts and I'll have you perform several goal pace workouts so you really dial in goal pace. And speaking of goal pace, this plan includes several of the predictor ...