Training focus.

How long you can remain focused is as important as what level of focus you can attain. 

How Much Cardio Should You Do Each Week?

If you are not a Competitive runner (meaning you get paid), and if you are not a Run Sport athlete (soccer/ lacrosse/ etc), then unweighted conditioning should not occupy more than 10% of your weekly training. "But Mark," some of you will say, "I get out of breath just going up stairs, so I need to work on my cardio." Really?? Did you walk up the stairs with your heart or did you use your legs. More often than not the individual who tells me they need to work on their "cardio" has weak legs. IF YOUR LEGS WERE STRONGER THE STAIRS WOULDN'T BE SO HARD, I PROMISE!