Exercices. Life. changing. fitness. How Often Should I CrossFit? One of the most common questions I get from athletes at CrossFit Impulse is, “How often should I train?” If you are considering CrossFit as your strength and conditioning program then you also may be wondering, “How often should I CrossFit?” CrossFit.com prescribes 3 days “on” followed by 1 day “off.” Strength & Conditioning for The Power Athlete. Videos. Competitions. The Fittest on Earth.