Treat Fitness like an Appointment
The biggest obstacle you will come up against is excuses and procrastination. If you can provide as many reminders as possible for yourself, you are more likely to keep to your commitment.
Treating fitness like an appointment gives it a sense of importance. Set a reminder on your smartphone and commit to it. If you have someone or something reminding you to do something every day, you are more likely to do it. You may even want to start a fitness program with someone else!