Soldiers demonstrate their agility by tumbling over apparatus.
Title: "PHYSICAL JERKS ... 1924. Ex-Service men note! ... Army's new system now includes somersaults".
M/S of a soldier in gym kit vaulting onto a large piece of apparatus ( a vaulting horse?), he somersaults off the other side, more soldiers follow and do the same, some are more advanced and tumble over the apparatus in one go.