When I first started college I found my schedule was very busy and I really had to make exercise something of a priority. When I had time off, or a later class I would exercise. I found that I was more motivated when I worked out in the morning because when I had a full day of classes exercising at the end of the day was almost out of the question... all I wanted to do was sleep. I would go to the gym early in the morning, work out for 30-45 minutes and give myself 30 minutes to get ready for class. The more easier thing to do was to watch my diet. I made sure to eat pretty healthy and exercised 4-5 days a week only 30 minutes or so. Weight loss was slow, but it stayed off.