Answer: selective optimization with compensation
Step-by-step explanation:
Gilles is demonstrating selective optimization with compensation. It should be noted that selective optimization with compensation refers to the lifespan model of the behavioral and the psychological management that has to do with adaptating to changes which occurs as a result of human development or due to age factor.
This is demonstrated by Giles. Even though he has lost some speed and is not as strong as he once was when he was younger, he is still a great shooter.