The attempt to maintain and/or improve your weight and appearance by going to the gym, while you're significant other has left for a significant amount of time, since you now find yourself with free time (time usually spent with him/her). In order to maintain a closeness while there is an absence of physical interaction, you begin sending "sexting" photos to remind him/her how sexy and badass you still are while showing off your newly found hours at the gym and to prevent any possible thoughts of straying.
i.e. "awe my boyfriend just left for europe for a month. I can't eat that, I have to not gain anything before he comes back. I'm hitting the gym. Gotta get my sexting body on!"