I think it's also safety:
If you lift weights first and than do cardio, you'll be tired, and maybe won't run/bike as fast.
But if you do cardio first, you'll be tired for lifting. It's pretty dangerous to lift while you're already exhausted from cardio. I wouldn't want to squat after running 3 miles.
__________________
Audentes Fortunas Juvat
"Focus on making the 5 lifts stronger and getting enough food. There will be plenty of time to worry about glycemic indexes, PERs, and Bulgarian Split squats later. Much later."-Mark Rippetoe
|