I'm looking for a great winter work out to keep me in shape. I'm very new to cycling (2months). My past sport activities have been football and lacrosse. I picked up cycling a couple of months ago and am looking to keep active and concentrate on a lower body work out and cardio work out suited for cycling. I live in a very hilly area (and snowy - Syracuse NY), and interested in finding a workout to boost cardio endurance as well as leg strength endurance for climbs. Can anyone help?