We assume this is a fairly unusual pastime but a charity has hailed a personal trainer who is back home after becoming the first person to climb backwards up and down Africa's highest mountain.
Ben Stewart, 32, from Northampton, reversed to the peak of Mount Kilimanjaro, in Tanzania, and back, to raise money for the British Heart Foundation, says the BBC.
It's reported Mr Stewart had already scaled some of Britain's mountains backwards to raise funds for the charity following his grandfather's death.
Mr Stewart said the trek was "the hardest thing I have done in my life".
Two people, one from South Africa and one from Nepal, have walked backwards up the 5,895m African mountain - but not down.
Apparently his training included using a special device to help strengthen his neck to cope with long periods of needing to look over his shoulder.
We wonder how often he used his bum brakes!