premise: How to become a calvin klein model<br>Do cardio 4-5 days per week to stay lean. A gym membership will be your best friend if you plan on having a future as a professional model. Begin performing cardiovascular exercise like running, swimming, cycling, or aerobics in order to stay trim and healthy.
hypothesis: Exercising will make you become a calvin kline model. 
reason: One is not sure if exercising will inherently make you a Calvin Klein model. It depends on numerous other things such as if you are ugly - exercise won't help. If you are beautiful exercise can promote you into a Calvin Klein model. 