if you're screwing skinny girls and want to rock some 'alpha male' points, pick her up and bang her. You'll need to do lunges as well as isometrics to build up the endurance in your thighs. An elliptical trainer with the resistance dialed way up would help too. I recommend a good half-hour of that, try to keep it at over 150 strides a minute so you can get your cardio in at the same time=)
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