Real Madrid players are performing a typical stress test, but with a portable system to measure their maximum oxygen uptake.
Products that analyse cardiovascular activity are nothing new but these body-worn, portable versions are top of the line.
It's not the first time Madrid have worn the masks, and they shared a video titled: 'The masks are back!' to their YouTube ...
When it comes to understanding your fitness and overall health, VO2 max is often heralded as the most important metric. So if ...
Real Madrid players have been pictured taking part in high-intensity drills while wearing unusual blue masks - so what's the ...
The Spanish club's physical trainer Antonio Pintus favours using the K5 masks to measure players' physical condition ...
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