cardio and heart rate???

[build420]

just wondering if i keep my heart rate around 70% of max while on the punching bag, can i use it as my cardio? does anyone do this?

[Bouncer]

Any physical activity can be considered cardio if you do it long enough really.

[bodymark]

Thats what I do plus jump rope are my only cardio.

[piratex]

I believe both are great for cardio if done aggressively & consistently.