Use the correct focus mode

When in the moment of a portrait photography shoot, it s easy to forget the little things. For 99% of portraits, I use single shot focus mode. However, if I switch to a shot of someone walking down a path toward the camera or a groom jumping as the couple runs to the chapel, then I need to remember to switch to continuous focus (Nikon) or AI Servo (Canon) so that the photo is sharp even though the subject is moving.