Cardio everyday?

[Roofus]

there is no reason why not to...

Except for my throbbing knee... I think I need new shoes.

 

[ALIN]

Is it a good idea to do cardio everyday?
I recently joined a gym and I have been either running on the treadmill or doing the stairmaster as part of a daily workout.
Do you think it could be unhealthy to do cardio everyday?
Also, how many calories should I kill when doing 1 cardio exercise everday?

I only do cardio on NON weight training days.