Chelsea manager Graham Potter took his squad of footballers for a training day at Longmoor Military Camp near Bordon last week.
The Sun reports the Premier League team participated in a series of mental exercises to encourage more togetherness in the dressing room.
Potter, who was appointed as Chelsea manager in September, is known for using off-the-wall tactics to build team spirit.
While managing Swedish club Ostersunds between 2011 and 2018, he got his players to perform ballet and perform traditional Finnish rap songs.