if someone offers you something for nothing, then you are the product. his "generous" offer is intended to convert runners into football players. he wants more folks turning up at practice so that he can turn them into running backs.
supplementary conditioning work is a generally good thing to do, but it is always worth remembering that your sport is a football coach's idea of punishment. football players who mess up or step out of line are punished by being made to run laps of the school field, which is what you do for fun. and this should be enough to tell you that their idea of fitness is going to be markedly different to what you need to run x-country.
also, take a look at their sport. they repeatedly stand around for five or six minutes at a time, then they have three nano-seconds of "action" during which they push each other over and a guy runs twenty yards while looking over his shoulder. the "star player," the quarter back, recites some numbers, stands perfectly still, and throws a ball.
wherever you stand on the idea of this being a sport, training to do that is not going to help you run x-country.
it isn't obvious to me what football players are going to get out of these drills but they are not the best for a track athlete or for someone contemplating running 5km x-country.
for off-season conditioning, you need to run a variety of distances from around 50m up to around 200m, at speeds ranging from your best 400m speed up to your best 200m speed, with long, slow, walk back recoveries.
you could also benefit from sessions of 20 x 200m at your best 5km pace, with a short jog recovery or sprint the straights and jog the bends, that sort of thing. and fartlek. anyone racing more than 400m will benefit from doing some fartlek work in their off-season.
football coaches probably think fartlek is something Germans put on their hot dogs.
cheers.