good ab workouts?
lay down in the sit up position and put your hands on your head and when you get the the top of the sit up touch your elbow to the opposite knee this works well
burn cals. in other words anything that makes you sweat
Planks are the fastest way... You just do 5 40-second planks at a time, take a break, and do it again. Repeat the cycle as many times as you have energy for...