Cardio and weight training are a far second and third to your diet. Diet is key to any kind of "toning". If you're getting serious about this, a 40/40/20 ratio is a very effective/all around good ratio. Carbs/Protein/Fat, so in one day 40% of your Kcalories will come from carbohydrates, 40% from proteins, and 20% from fats. Some people agree with this method, others just watch what they eat. No candy, no soda, no simple sugars, etc. you're mainly left with lean meats, dairy, some fruits, vegies, dark rices/breads, etc. 10lbs isn't too much weight, especially if you're motivated. Good luck.