Hi Wendy!
Wow....76 pounds is great and you should be so proud of yourself! Cardio is a very important element for burning those calories, promoting your daily caloric deficit! However, strength training is just as, if not more important, to become more metabolically efficient by maintaining/increasing lean muscle mass while losing the weight! Because muscle burns more calories than fat, as you become more lean, your body requires more energy to function all day!
I would encourage you to really make the effort to get in 3 strength training workouts each week for approximately 25-35 minutes each session. Unfortunately, short of surgery, it is going to be challenging to completely rid yourself of the loose skin on your arms. However, if you begin really focusing on lifting your weights, you will definitely begin to notice a big change! The alli website provides animated demos for a full body workout. Go to "myactivity" and click on "strength training log" to view them. You only need to perform 2-3 sets and 8-10 reps of each exercise to begin to see positive results! Additionally, I see wonderful results with using your own body weight, such as push-ups. Try to incorporate a couple of sets of push-ups even on your cardio days. The exercise bands are also great for creating lean, long muscles!
Keep up the great work and stay committed!
Kelli