Answer:
His behavioral intention is being most affected by Personal Attitude
Step-by-step explanation:
Behavioral intention is a concept that shows an individual's readiness to perform a given behavior.
This intention could be motivated by a number of factors such as low personal control, low motivation to comply with the wishes of others and vice versa.
However, in the case of Jason, Personal Attitude is responsible for his Behavioral Intention since he is personally motivated towards exercising.
From the question, it is clear that he likes to exercise - a personal attitude.