what is the most effective ab exercise (crunch v. plank v. bicycle)?

I am at a cross roads with finding the best ab exercise. one source says it is the bicycle, another says that planks are scientifically proven to be it, and tradition says the crunch is the one. which is it?
ps- i know about body fat and masking the abs, so I [...]

Ab Isolation Exercises : The Bicycle Ab Exercise

Great abs don’t come easy. Here are a few free tips on how to do the bicycle exercise to flatten your stomach and show off that six pack. Expert: Madison Chase Bio: Madison Chase is a professional actress and personal fitness trainer in Los Angeles. Filmmaker: Nili Nathan


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