Swimming

[m_donnelly]

Do any of you use swimming as your primary form of cardio when cutting up?

[CMB]

Not I. Mainly because I'm short and stalky and never really learned strokes.

But if you can swim for 25+ minutes and keep your heart rate high for that long then go for it. There isn't a better option for cardio. As long as you can get your heart rate in the zone for a longer period of time then it will work.