Q: why do u recommend doing cardio on days when one doesn't weight train? (in reference to question 157)

A: I recommend cardio to be on non-weight training days so your muscles are fresh before weight training and have a chance to recover after the weighttraining. Cardio prior to weighttraining would tire the muscles out before you even start lifting and you won't have as quality a workout. Cardio soon after weight training would interfere with muscle recovery.

It's not a huge deal, but if all other things are equal, keep weights and cardio to separate days.