One of the keys to working out consistently is to find something you enjoy doing and to do it at the same time each day. I enjoy body-weight exercises for strength training (for example pull ups and push ups) and a combo of activities for cardio. I always do some form of a workout in the early morning hours.Lately however, I've been experimenting with working out, on and off throughout the day- mainly because I'm enjoying the things I'm doing.
So I might do 200 pushups before breakfast. Then work for a few hours in the office and at lunch, go for a run or bike ride. When I'm in the office, I may do sets of pushups or isometrics in between phone calls. At the end of the day, depending on my energy level, I might ride my stationary bike after dinner while watching TV.
If you're interested in weight-free strength training, check out the book in the photo as it's a great introduction to this type of workout.