New Delhi, May 28 -- Memorial Day, observed in the United States on the last Monday of May annually, honours US military personnel who died while serving in the country's Armed Forces. While visiting memorials and cemeteries is one way to honour the fallen heroes, there are people across the globe who also perform the high-intensity Murph workout or Murph challenge.

This Murph workout, launched by CrossFit as a 'hero workout' in 2005, was created in memory of Navy Lieutenant Michael Murphy of Patchogue, New York. He was killed in Afghanistan, June 28, 2005, when he was all of 29 years old.

According to the official CrossFit website, the phenomenon of Memorial Day Murph was born organically within its community, before it was deemed a 'h...