If you aren't ready to hit the gym, or you just can't bear going outside, there are ways of getting fit at home that involve nothing but your towel and trainers.
Zaggora, the activewear company, have put together a hot winter workout written by Linda Jones that takes around 15 minutes and can be done in your living room. It's a high intensity exercise followed by lesser intensity and a rest period. If you have kit that heats up (like Zaggora do) make sure you wear it to get the most out of your exercise.
The benefits, they say is that it drives up your metabolism, keeps you warm and doesn't involve the gym. You'll need to spend three minutes warming up and cooling down - which is important to protect your muscles.
In every round, you do each exercise for 30 seconds each, followed by 20 seconds of rest.