Find a workout buddy!
Firenze, I am *so* with you. I have been getting sad and tired in the winter for my whole adult life. I also crave exercise, because I have been a fitness professional since 1999. But even I get low in the energy department once the sun starts setting at 4 p.m.! It got so bad last year that I (gasp!) STOPPED working out. Horrible.
My solution: I now have a workout partner, and even if I am tired and depressed, I would not miss our gym workouts for the world! We count on each other and we never, ever cancel, no matter how down or busy (we are both grad students) we are. It is the best arrangement ever. We work out twice as hard as we would if we were working out alone, and because we get to chat between sets, we don't even realize how much work we are doing until we are exhausted--and happy!--at the end of the session.
Do you have the opportunity to post a flier or notify other women in your area that you want a workout buddy? I met mine at a networking event at school. But seeking out other students in spin classes or yoga classes might be a great idea.
Best of luck!
There's only one thing better than spending a day on my bike: Spending a day on my bike in good company.