I want to train for a half marathon, can kick-boxing by my cross-training?

I’m going to start an 8 week half-marathon training schedule, and on the days I’m not running it says to x-train. I love my kick-boxing classes… would that not be a good x-training activity, though, since it’s not ‘nonimpact’… or does anyone think I’d be ok to do it?

 

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