Luckily this time, I was paired against Myra, who couldn’t throw a good punch if someone was controlling her arm for her. I got a good hit in during the first two minutes. She fell down and was too dizzy to get back up. I should feel triumphant, but there is no triumph in punching a girl like Myra.
What does "in" mean or imply as in "I got a good hit in during the first two minutes"?