CrossFit HQ recommends a three-day-on, one-day-off pattern of training days but has also recommended a modified regimen: five-days-on, two-days-off. This works well for people that want to keep a regular pattern of weekly training. This would be the maximum recommended number of days to train in a week. We prefer one day on and one day off. How many times a week to do CrossFit depends on your goals. 3 days a week is sufficient for non-professional athletes.