[header] How to become a calvin klein model [title] Do cardio 4-5 days per week to stay lean. [step] 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. 
Your goal should be to get your heart rate up, break a sweat, and maintain a steady pace for 30 minutes to an hour at a time. [substeps] To continue seeing progress and maintain your figure, you'll need to find time to fit regular exercise into your busy schedule.