Build up shuttle sprints starting at 10 yards and increasing 10 yards on each shuttle until reaching 100 yards. Then begin to shuttle back down decreasing each shuttle by 10 yards. Perform 10 push ups after running 10 yards, and decrease the number of push ups performed by 1 each time you increase the running distance. And then decrease the number of push ups performed by 1 each time you decrease the running distance.

EX:
Run 10 yards, 10 push ups
Run back 10 yards, 10 push ups
Run 20 yards, 9 push ups
Run back 20 yards, 9 push ups
Run 30 yards, 8 push ups
Run back 30 yards, 8 push ups
etc...