Abs and calf
Cardio exercises are best for burning fat and building lean muscle. To tone up throw in some HIIT (High Intensity Interval Training) exercises.
These exercises give you that great mix of cardio and strength training in one workout. HIIT exercises force you to work hard in short intense spurts with little recovery time.
I built my HIIT exercise (Core Blast) from workouts I found here and at ab-workouts-guide.com If you like it checkout Core Abs & Stretches, Cardio Fight Club HIIT, MAX Tabata Test, or 5 Min Arms & Abs they're fun and challenging.
Good luck and God Bless!
Calf raises and jogging are great for your calves!!