Ukraine: 'Moscow bombs boarding school'

1425.995 - 1447.325 Ella Bicknell

The carbon monoxide breathing method is the latest craze, with three-time Tour de France winner today Pogacar and his two-time winning rival Jonas Vingegaard confirming their previous use of the controversial but legal practice. When used during altitude training, the toxic gas can measure the blood's levels of haemoglobin, the protein in red blood cells that boost movement and endurance.