Final answer:
The first step in training according to the Humane hierarchy is to employ positive reinforcement, which includes rewarding desired behaviors to increase their frequency.
Step-by-step explanation:
According to the Humane hierarchy in training, the first step is to use positive reinforcement. This method involves adding a desirable stimulus to increase a behavior. For instance, when training a dog, asking the dog to 'sit' and then providing a treat when the action is performed correctly reinforces this behavior. The dog associates sitting with receiving a treat and is thus more likely to repeat the behavior in the future. It's important to understand that reinforcement is more effective than punishment for teaching new behaviors.