This drill, at Gordonstoun on Monday, involved almost 500 pupils
Pupils at Gordonstoun boarding school in Moray are stepping back in time to the 1930s to celebrate the school's 75th anniversary.
Students are following the original timetable, including the strict outdoors regime for which the school was known.
They started the day with an early morning run and breathing exercises, followed by milk and biscuits.
Male pupils are wearing shorts, which were regulation uniform at the time.
Mark Pyper, principal of the school, said: "The 1930s day will help us all understand and appreciate our history while looking forward to an ongoing, successful future."
The mid-morning break was set to prove more demanding than most schoolchildren are used to, as the Gordonstoun pupils took part in a military-style exercise drill on the main lawn.
Lunch was based on a typical menu from the school's early days, with broth, braised steaks, vegetable and barley casserole and sponge pudding on offer.
Mid-morning exercise was an important fixture in the school's early days
Students were then due to visit the school chapel and enjoy relaxation time during which they lay down to rest and were read to by staff.
A warm wash and cold shower in the late afternoon will prepare them for an evening of study, with a short break for sport or a gentle walk.
To finish the day students will observe five minutes of silence before "lights out" at an earlier time than is required today.
Gordonstoun was founded in 1933 by Kurt Hahn, who also founded the Duke of Edinburgh Award Scheme and Outward Bound.
The school is famous for its connections to the Royal Family, with Prince Charles, Prince Andrew and Prince Edward among its former pupils.