Stan Smith

7 easy ways to become a fitness model -- for your kids

7 easy ways to become a fitness model -- for your kids

He's a celebrity fitness trainer to Kate Upton, and Jennifer Lopez wrote the foreword to his new book, "Ultimate Family Wellness: The No-Excuses Program For Diet, Fitness and Lifelong Health."

And David Kirsch is also a single parent of twin 6 1/2-year-old girls.

His book doesn't just speak to stressed-out, super-busy single parents juggling family and career but to all of the multi-hyphenate, time-stretched among us who swear there aren't enough hours, minutes or even seconds in the day to workout.

The book includes Kirsch's 5-5-5-plan, which includes five quick exercises (many for just adults), that he says can help you lose as many as five pounds in five...

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