One day a week, my XC team stays inside and does an hour of explosive drills instead of running. These include explosive lunges, prisoner squats, and things of that nature. From my perspective, these exercises seem to train muscles that aren't relevant to distance running, take up time that could be used for a long run instead (we do very little mileage), and lead to extreme soreness that negatively impacts the quality of the rest of the week's workouts. However, my coach (who is a former sprinter/jumper) says that they are necessary. What do you guys think?