The best idea is to find a way you can keep up with your training at home. Decide on some home exercise equipment that you will enjoy using and simply train while watching TV or listening to music.
Possible home exercise equipment you may enjoy using:
1. If you are into cycling looking at a bicycle trainer is a good idea. With a bicycle trainer you simply mount your bicycle on the trainer and you are ready to go. The best one I know about is the Kurt Kinetic Road Machine Indoor Trainer. It is quiet and you can watch TV or read while you are on it.
2. For those that are not into cycling and would like to get something that does not have a hefty price tag, I would suggest something like the Stamina Spacemate Folding Stepper. This is relatively cheap and does not take up a lot of space ad it folds away for storage.
3. Now for the option I like, treadmill. If you get a good treadmill, and you have the space to put it, you will get a really good cardio workout and you will enjoy it. For a gym quality treadmill without the price tag you should really have a look at the Sole S77 Treadmill. It has everything you need for a stimulating workout.
So, these are only three of the options you have. Unfortunately, no more excuses veging out in front of the TV! Get some home exercise equipment and enjoy keeping fit during the winter.