At each corner start with 5 merkins, run to cul-de-sac do 5 merkins+10 squats, run back to the corner for 5 merkins +10 squats+15 of a different exercise, every time back and forth up to 25 and then back down dropping 5 every time. Ended just in time.
I forgot to mention the mailbox burpees going from corner to corner. Strong work boys!