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That's up to you.
I generally do cardio daily and strength training every other day after Cardio
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Hey @pcarsley and @WendyB, what a great day to step into the community! 
I've moved your post to the Discussions Board so you can get more opinions about this inquiry from other Fitbitters, personally I've tried to do cardio and a really strength workout in the same session and I was doing good after that, however I recommend you to check this with a personal trainer or a doctor so you can have a professional opinion in the matter.
I'd like to invite you to check more discussions like this one, recipes and inspiration to have a healthy lifestyle!
I'll see you around! 
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