How can i get a six pack fast?

I use to have a six pack when i played sports but i don’t play sports anymore becasue i got hurt. I am very skinny but i just lost my pack. I want to know an easy and fast way to get a six pack for girls. I guess you ould say i have a 2 or 4 pack depending on what im doing. Tip and suggestion would be appricieated and im only 15 so i don’t have like weights or can get to a gym.