Cardio isnt really a workout persay... Weights are what JB is reffering too.
Cardio is best done upon awakening on an empty stomach... but if you do workout then do cardio... Id just shoot the LR3 when I got home...
I still think its not the best way to do cardio, as your body is repairing your muslce and you are running... no nutriant intake is badnews. So try to work out then have the proper nutrition along with the LR3... then do cardo later... or better yet, like I said, in the AM