After I lost weight and began toning my muscles. I found that I was too inconsistent with weight training (e.g. one week I could curl 25 pound dumb bells and the next week I could barely do 20). I needed to build my core strength and couldn't do so using isolated workouts that involved weight. I began using P90X, although it's hard, the results are absolutely worth it. You may download or purchase P90X (legally, of course) at various websites. Start with the cardio workout maybe 1-3 times a week and you will see results!
Remember to check every Wednesday for updates on my initial diet guide post. I will add tips and suggestions to my guide every week.