I always exercise the first thing in the morning. If I postpone exercising, generally it will be postponed till the next day. Always do something you enjoy like walking, riding a bicycle or hiking. When you look forward to your routine you are more apt to stay with it. Why not turn on some music and do some exercises at home, when outdoors is too cold or rainy. You don't need a gym to stay in shape. I have weights, a jumprope and heavy ball that I use everyday. Sometimes I just do a few series of jumping jacks.