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[teiresias]

OK, I generally do pretty damn hard out cardio for like half an hour, but i've been told that interval training for 20 or even 15 minutes is just as effective. So I'm wondering how long an interval actually needs to be for this kind of cardio to be effective and how long the rest interval in between the intense intervals needs to be.

 

[Go Go Ackman!]

Thirty seconds to a minute, I think you ramp it up as your ability to do it increases. It'll be difficult at first!