Motivation is lacking again

I gained about 5 lbs since getting back from Jamaica. I'm not very happy about that. BUT I haven't been to the gym since before we went (its been over 3 weeks at least).

I really need to go to the gym and work out but the idea depresses me. I HATE it. I HATE working out. I try to tell myself I'll feel better afterward, but I just can not convince myself, and I'm not sure what to do about this rut.