I invented a pedal-powered home office. Now I exercise – and save energy – at my desk

• Read more from the DIY Climate Changers, a new series on everyday people's creative solutions to the climate crisis

Jim Gregory, 59, loves to cycle. More than a decade before the work-from-home revolution, the Iowa business owner was grappling with a conundrum now faced by many: how to stay active while spending so much of his day at the computer.

Jim wondered if he could combine the joy of cycling with a desire to reduce his energy consumption. Thus was born the PedalPC, a machine built from a repurposed bicycle trailer that generates enough electricity to run his computer, printer, phone chargers and home wifi.