Better routine in 20 minutes without equipment

Boutique Fitness Studio ModelFIT is famous for sculpting the toned, tense physicists of the women who adorn the catwalks of the world (think Miranda Kerr and Karle Kloss!).

The studio has only two locations, in Los Angeles and New York. So, to feel the ardor of ModelFIT, you had to be in either of those two cities ... until now.

With the launch of the new ModelFIT application, you can do all the exercises you dare in your own living room, for $ 20 per month.

Curious what is really a sweat session ModelFIT? We have a preview of this 20-minute weightlifting sequence directed by coach Javi Pérez.

The training is so effective because it is "conscious, precise and objective," says Perez. The trick to getting results, he says, is not necessarily to work harder, but to work smarter.

In this routine, "we focus the laser on the target muscles, and fatigue those muscles through consecutive non-stop movements".

Ready for a tighter butt? Take a hand towel and do it.

And if you're hungry for more, check ModelFIT online. You can give the application a trial run with a free 7-day pass. The trainings are 30 minutes or less, with new videos every Tuesday and Thursday. And for the moment (all of us), some of the routines are just five (hard core) minutes.