Are you a smoker? Do you think smoking has no effect on your lung capacity, particularly when it comes to your training?
Au contraire, mon ami.
IFLScience posted a video of two sets of lungs filling with oxygen- one set belonging to a smoker, the other set to a healthier set of lungs.
Take a look at the video and ask yourself what sort of amazing cardio you could have if you would just stop smoking. Or, if you don’t smoke, show it to someone who does, so they can contemplate the near superhuman cardio they could have if they would just quit smoking.
Otherwise, have a great day everyone!