Sprint Pyramids!
Make sure you warm up effectively before jumping into this one. Run about 3 min, followed by 30 sec each of:
High Knees
Butt Kicks
Side Shuffle (Right and Left)
Carioca (Right and Left)
Skips
Then 10 meter sprints. 10 do reps, increasing pace with each one until you finish at a full sprint.
Workout:
Run hard for 30 sec (90% effort)
Walk 30 Sec
Run hard for 60 sec (80-85% effort)
Walk 60 sec
Run hard for 90 sec (75-80% effort)
Walk 90 sec
Run hard for 120 sec (70-75% effort)
Walk 120 sec
Run hard for 120 sec (75-80% effort)
Walk 120 sec
Run hard for 90 sec (80-85% effort)
Walk 90 sec
Run hard for 60 sec (90% effort)
Walk 60 sec
Run hard for 30 sec (ALL OUT EFFORT)