New found love of exercise

So this has been a weird week. I have been loving exercise! I have almost hit my 10 mile goal for the week. My sister beat me to the goal today, but its cool! I am at 9.67 miles. I walked 2 miles at the gym this morning! SOOOOOOOOO boring! I hate wasting gym time on the treadmill but there were no classes I wanted to take. I am going to try to get there tomorrow am for a Body Challenge class. I have been wanting to go to this class since I joined the gym. I think I will go to bed early and try my hardest to get up and go. It was so nice starting my day with exercise. Since I have been working out this week, I have had a ton of energy! I worked out this morning and my sister and I did another walk with the kiddos tonight. We logged another 1.7 miles. It is amazing how easy walking and working out in general is now that I am so much thinner. I love it! And if I want to keep this body (and make it even thinner and stronger...) I HAVE TO WORKOUT! It simply has to be a fact of life if I want to keep the weight off. I don't need to be a crazy gym rat, but regular exercise is essential. I really need to start weight training. I am scared of doing weights at the gym outside of a class. I don't know why, but the machines confuse and scare me and the free weights are just so intimidating. I am way to self conscious to attempt it at this point. That is why I want to go to the Body Challenge class because it is mostly weight training. I feel like it will help me learn some new moves and give me some much needed toning (and confidence!). What kind of exercise do you all do?