Prowler shuttles/sprints

In teams, push a heavy prowler 10 meters, sprint back to the starting line and tag a team mate.
They sprint to the prowler, push it 10 more meters and then sprint back to the start.

Continue out to 50 meters, and then push it back in 10 meter increments.

Then 20 at a time (out to 40 and back)

Then 30 at a time (out to 30 and back)

Then each team member pushes it 50 meters once