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When to add HIIT to routine

Hi everyone,

I've got back into exercise again for almost 1 month. I can already feel my endurance getting better. I wanted to add HIIT to my routine, maybe once a week, but I'm not sure if it's too early. When would you add HIIT to your routine? How do you know when you're capable of doing HIIT?

Thanks guys :)

Renee