A lot of the yoga workouts have some good stretches to help you prepare for splits. You just need to stretch daily, take it slow so you don't hurt yourself and you'll get there. Just try to stretch daily and you'll be able to do them.
Half-bound lotus and open triangle will get you started. You can find them both in Feel The Burn Yoga. Child'snpose will also help, if you spread your knees further apart.
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