Another pinner said: This website is AMAZING. It is my workout bible, and best of all, its completely FREE. Tons of workout vids and plenty more to stave off ruts. Most of the routines are between 12-20 mins long and thats all you need.
BodyRock: Get in the best shape of your life at home for free
I LOVE THIS GIRL! She has amazing work outs that usually take around 15-20 minutes and work you very hard! She puts videos on her site for beginner, intermediate, and advanced levels. I highly recommend her videos
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Insanity Workout - Do each of these 6 moves for 1 minute without stopping between exercises. After you've completed 1 round, rest for 60 seconds, then go again. Perform the circuit 3 times (20 minutes & done!) 2 days in a row. Take a rest day & repeat.