core strengthening help.

Hi, I'm still pretty new to this but am doing well. I'm looking for help with regards to doing core strength exercises. I'm currently doing 30ds level 2 day 1 tomorrow. I have a yoga mat and two 1.5kg weights and my own body weight 157lbs I work out at home and can't afford the gym and have no money or space for more equipment I enjoy yoga. Basically can someone direct me to a DVD,book, website with exercises I can do for core strength any help is appreciated. :)

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