Bricks have been used for thousands of years for building man made structures. We use them to build (man/woman). A little unconventional? Maybe. Effective? We think so. We run with 5 pound bricks in hand for a mile. We stop about every 300 meters and do shoulder, back, and arm exercises. Those little rascals start getting heavy after a couple few hundred repetitions. Later in the day, we may find simple tasks not so simple. That's the little reminder.
When we were finished wearing out our arms, we ran. The first 800 meters was 3:07. The second was 3:02. We had a crowd lined up (shoulder to shoulder) across the street at the finish. These work outs are running like a well oiled machine. Speed begets speed. Strength begets strength.
3 1/2 miles, lots of upper body. good paces.