CrossFit will make you stronger. CrossFit will make you fitter. Bulky and weight gain are different entities. Lifting weights may cause a slight increase in body weight because muscle is heavier than fat. Liking what you see in the mirror, liking how your clothes fit and liking how you feel are more important than what the scale says.
With regards to bulkiness, being bulky or not bulky depends greatly on genetics, diet and programming. We as coaches can provide nutritional education and proper programming based on your goals.
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