I agree with the comments on finding a physical activity you enjoy doing and mixing things up. The element of fun is very important when it comes to forming a habit. You can do something out of discipline or force yourself to do something you hate for the sake of reaching your goal--which in this case is weight loss. You may be able to push yourself and keep up with what you are doing for a time, but it is very unlikely that you will sustain the activity for good. Trust me. I’ve fought this battle too many times to count.
The best way to get and remain active is to choose ACTIVITIES you enjoy. Find several activities you love and create an exercise plan that involves all of them. For example, you can do brisk walking on Mondays, weight training on Tuesdays, elliptical workouts on Wednesdays, back to weight training for Thursdays then some cycling on Fridays and so on. The idea is to vary activity to keep things interesting. You can choose to do a different activity per day or per week. Whenever you start to get bored with your workouts, find new ones that will get you excited.