Gym Membership renewal. Who do I choose. Serious answers only please? I need to make a decision by Monday!?

I have belonged to the same Gym for 4 years, Every year when it is time to renew. I have been getting a 2 for one. I pay for my memebership, and I can sign up a family member or friend for a free one year member ship. Last year my sister insisted on me choosing her. Since she is my sister I did. But she went a... show more I have belonged to the same Gym for 4 years, Every year when it is time to renew. I have been getting a 2 for one. I pay for my memebership, and I can sign up a family member or friend for a free one year member ship. Last year my sister insisted on me choosing her. Since she is my sister I did. But she went a total of 5 times in that year. No matter how hard I tried to get her to go with me, she always had some thing more important to do. Now she wants me to let her use the free year again this time. But I work with a girl who is getting married next June, she is chubby and has mentioned that she would love to join a gym, but they are paying for the whole wedding themselves. I would like to give the free year to her as I am sure she would use it and appreciate it. I would like to make it an early Bridle shower gift. What would you do? I don't want to hurt my sisters feelings. But I can't see wasting another years membership on her for what it normally cost.
Thanks ahead of tiem.
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