800m run

Then:

In 15 minutes, do sets of deadlifts
Rest as much as you need (but don't be lazy and rest too long), go as heavy or as light as you need and to reps and sets schemes as you feel.
Do as much work as possible in the 15 minutes

"Rapid end"

4 Rounds of:

10 Goblet stationary lunges
10 Push ups

Rest as little as possible and complete in as little time as possible