Sworkit ~You choose your workout time (up to one hour) and goal (back, core strength, full body, etc.). Sworkit then generates a series of randomized 30-second routines (none of which require equipment) for you to follow, along with handy pictures of what each task actually looks like. At the end of every 30 seconds, a whistle blows and you’re on to the next exercise.
CrossFit Mamas- blogger who is a mother of 4 decided to do to cross fit as her husband has done for years... within 5 months she was in the best shape of her life and these workouts were done within 15/20 minutes 4-5x/week! She altered the workouts to be done at home and for the females!!!