There’s not much that’s more essential to your running (and your life) than your blood.
The more oxygen-carrying power your blood has, the faster you can run. Without enough oxygen, your body is quickly plunged into acidosis, the deep burning sensation in your legs that you feel at the end of a race or a hard workout.
Doing anything that would decrease your body’s oxygen-carrying potential would be crazy right?
Well, maybe not if it can save somebody’s life.
Blood donation groups like the Red Cross advise against heavy exercise the same day you donate, to avoid reopening the needle wound and because you may feel dizzy or faint from low blood pressure. Be aware that frozen blood has a 48-hour lifespan, compared to four weeks for fresh blood, makes me understand why there are constantly blood drives. But the last time I checked, those on blood thinners are not allowed to donate. If you can, please consider donating or encouraging those who can to donate blood.