Answer: Sensation seeker
Explanation: Sensation seeker is the person who has the feature or habit of gaining feeling of sensory delightment and excitement. This mechanism is also known as excitement seeking.
The person persisting this feature will tend to perform and experience intense, risky and complex activities for their own sake to receive pleasure .
Therefore, according to the question, Jack is sensation seeker and because of that he likes to take up intense activities like bungee jumping , skydiving etc for experiencing sensation and joy