Pilates beneficial?

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I'm pregnant and have had to go from the jillian michaels dvds to a mix of biking and fitness DVDs. I have a Pilates DVD and was wondering if anyone finds that it really does help with strengthening/toning? It's not super challenging like I'm used to with Jillian Michaels, which is why I'll do 30 minutes of Pilates with biking.

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