I am in need of flirting tips, please :]?

well i like this guy on my swim team, were both fourteeen. at practice he always grabs my leg, pokes me, and jabs my side, lol etc. if this sounds weid then all i can say is that you'd have to be there. he is hysterically funny, good looking, popular, and has amazing hair. lol...is he flirting? and how can i flirt back showing that im interested? lol thanksss<3234563