As a society we tent to give up when we don't succeed the first day or week. When we don't see the scale moving like we wish we would we tend to get discouraged. Weight lose is not about being perfect and always being able to do every activity with no effort. It is not about losing 7 lbs a week.
Keeping track is hard. Eating right is hard. The unknown is hard. Waking up early is hard. Finding time is hard. Running is hard. Biking is hard. Swimming is hard. Workout videos are hard. Strength training is hard. Getting out the door at all is hard and sometimes getting in your workout cloths is hard. All of these things are hard but none of them will kill you and they each gets easier every time you do them. Each day you decide to put the effort out to keep moving in the right direction you are closer to your goal. Every time you decide this is worth working HARD for you get closer to the healthier you.
"YOU CAN DO HARD THINGS"
And as you work hard and accomplish hard goals you will find life can become easier because you have already done something hard and succeeded.