Is this a good idea? Two competitors look scared as their take part in the 3rd German office chair championships in Bad Koenig-ZellHere are a group of guys who always enjoy a good day at the office.
They are the 58 competitors reaching speeds of up to 22mph racing down a steep hill in a sleepy German town.
It was the third running of the German office chair championships - and each year the entrants get increasingly bizarre.
Spectator sport: This man has decked his office chair out with a spoiler and handles to help him go faster 
Lift off: Georg Seeger leaves the ground in his beer-themed office chair during the 600ft descentPierre Feller, from Luxembourg, took the title in the Bad König-Zell, in Hesse, on Saturday, completing the 600ft downhill run in just 26.95 seconds.
Competition organiser René Karg told www.local.de: 'His lying-down technique was sensational!'
Strict rules are in place for competitors. They are allowed to fit inline skate wheels and handles to their chairs, but no motorised aids are permitted.
Mr Karg added: 'We check each chair in advance.'
Near miss: Two competitors come close to a crash as they wheel over a ramp
Giddee up: Heiko Winter, left, won the best design for his horse-themed office chair
Along for the ride: One brave competitor smokes a cigar as he makes his run and, right, another winces as he crashes after crossing the finish lineThe participants race in pairs wearing protective padding as they launch themselves from a ramp.
Second and third places were won by Andreas Ripper and Finn-Jan Rucktäschel.
Heiko Winter won the best-designed chair. His effort was fitted with a horse's head and a saddle and he was dressed as a cowboy.
Wipeout: This sequence of pictures shows the moment one entrant lost control of his modified chair and went flying
Golden ticket: Pedro Crespo flies along with his knees inches above the ground during the competitionsource: dailymail