Lowering Resting Heart Rate Without "chronic Cardio"

I'm very interested in lowering my resting heart rate, given the correlation of a lower resting heart rate to greater longevity. However, I've also read about the drawbacks of "chronic cardio". 


What's the optimal way to lower resting heart rate from a health perspective? It seems like it's probably HIIT but I wanted to confirm that before I dove in full-on. 


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