why am i gaining weight when im excersizing more, and eating the same?

i have been taking tennis for only a week which burns 510 cal. an hour, and we do conditioning for an hour which burns 600 cal. an hour so if i burn 1110 cal. from just that and i eat the same, how come im gaining weight, i have gained 4 pounds in just this week, where as for before tennis i had stayed the same weight for almost a year. please help!
 
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