A couple of old favourites from Rugby days that I'll be using again:
Shuttles
I quite like this variation.
Set out a line of markers at 5 metre intervals up to 25 metres in total. Working to a fixed time of 30 seconds shuttle up 5 metres and back, 10 metres and back, 15 metres and back etc, until 30 seconds is up.
Rest for 30 seconds and repeat the routine, attempting to get as far as you did on the previous rep, although you're expected to tire as each rep is completed maximally.
Complete 6 reps
Straight Line Sprints
Set up markers at 10, 20 and 30 metres.
First sets are "change gear" sprints, increasing your pace from 80%-90%-100% over the 30 metres. Do 6 sets with 30 seconds rest between.
Next up are "hollow sets" where you take of at 100% for 10 metres, take the power off for 10 metres, then apply full speed again for the final 10 metres. Do 6 sets with 30 seconds rest between.
For the final sets take off at 100% and ease off before 10 metres as you turn around into reverse/backwards running for the next 10 metres, before rotating back with balance and sprinting the last 10 metres. Do 6 sets with 30 seconds rest between.

