What is the best way to work out your abs and obliques?

Question

Without workout machines.

Answer 1

Lie on your kitchen floor.
Knees up.
Feet up under the bottom edge of your kitchen cabinet.
Hands across your upper chest.
RAISE your upper back 1/4 up off the floor.
HOLD for 20 seconds.
FEEL your abs shake.
Do not go higher up, your sides and back muscles are then holding you up. Test; go up higher, your abs stop shaking.
Do not put your hands behind your head. Then you are pulling yourself up.
Do every OTHER day.

Answer 2

what worked best for me was boxing or using a punching bag, and cross country skiing. i found crunches and sit ups were hurting my lower back, and i wasnt getting very good results from them. and remember, even if your abs are super toned and ripped, you wont be able to see them if theyre covered with a layer of fat. so its important to do a lot of arobic activities that work your abs plus burn fat too. another good activity is rowing.