trailer filled with rocks would work
In the olden days, a brick in the saddle bag was the way to slow down anybody who was being a bit too sprightly on the club run. Except on one occasion when they couldn't find a brick but did find an unexploded mortar shell...
Did he win the sprint?
Does that actually make much difference they got up to a steady speed? Unless the point is trying not to sway the WW2 bomb enough.
@gbj_tester started
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trailer filled with rocks would work