20 Double Unders
In the remaining time, do as many as possible, rotating through the exercises –
(Round 1 = 20DU, max pull-ups. Round 2 = 20DU, max pushups. Round 3 = 20DU, max sit-ups….)
Men who know themselves are no longer fools. They stand on the threshold of the door of wisdom.
– Havelock Ellis